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The inciting incident was that the only canon that existed that had a birth date for Ki Adi Mundi indicated his birth as being a good number of decades after the Acolyte takes place, combined with more lore and canon stating that his species is relatively short lived.

Then, someone edited his listed birth date to be roughly 30 or 40 years before the Acolyte takes place, with absolutely no citation, so as to allow Mundi to be alive in the show.

That is what blew up into the insane drama which has apparently now resulted in death threats. Someone just took it upon themselves to invent a vague time frame of possible birth date with no actual source.

Cereans (Mundi's species) who live to 60 years are considered 'ancient', and well, now that the Acolyte show exists, Mundi would be 120 or 130 in the prequels. This would be akin to a human living to something like 220 years old with 0 explanation.

The other reason people are angry about the retcon is because Mundi has nearly no lines in the prequels, but one of the few he gets is to express shock at a report of Sith:

Impossible. The Sith have been extinct for a millennium.

Yet, in the Acolyte, he is shown to be aware of a rogue force user as he receives reports of this.

Basically, him being alive or not aside, this means that either he is a moron/incompetent who never followed up on this report, or a liar covering up a conspiracy... and because he says this amongst the Jedi High Council, this becomes transitive and means they are all some combination of either incompetent and/or knowingly going along with a lie, and have been for decades.

In the Prequels, the excuse for the incompetence of the Jedi High Council is that basically Palpatine was exuding some kind of Dark Side 'confusion' 'mind clouding' effect that made the Jedi never realize what was going on, being unable to sense a Sith in relatively close proximity to them.

This does not work going backwards about 100 years as Palpatine would not have been alive.

Who knows, maybe episode 8 will offer some kind of explanation for this?

EDIT: Ok, I have now seen episode 8.

While the show very much seems to be setting up for a second season... given that this is easily the most controversial, poorly received by fans and least watched of the Disney + Star Wars shows... I do not know if that is going to happen.

As it stands...

Err, well, ok:

SPOILER WARNING

Every single Jedi involved in the original Brendok incident is dead.

Every Jedi tasked with investigating Mae's murders is also dead.

Osha and Smilo have escaped, Mae had her memory wiped for everything after she started the fire...

And Venestra is leading a coverup of the entire affair, and has pinned all of the recent Jedi deaths on Sol.

The last scene is Venestra approaching Yoda and saying 'we need to talk'.

While this arguably makes Ki Adi Mundi less of an idiot and or liar, as presumably the cover up would involve a fake explanation for what he had heard...

...This now makes Yoda into seemingly knowing most of what has gone on as Venestra would presumably tell him the truth, and they would together mastermind a coverup.

Venestra is earlier shown force sensing Smilo and would presumably know he is a Sith simply from detecting him, and also later mentioning that he was her former apprentice who turned.

This means Venestra knows a Sith exists.

So now instead of Ki Adi Mundi, a minor character, being either a moron or conspiratorial liar...

Now it is Yoda who is almost certainly a conspiratorial liar in the Prequels and Original Trilogy, who knows that Sith have existed in the not so distant past, and has collaborated with Venestra to cover this all up.

As for what I would consider not major spoilers:

Welp, much of what was established and agreed upon by a great deal of I guess 'formerly' canon material about khyber crystals (sp), how they work, how lightsabers are constructed, etc, that has all been changed or just ignored.

(Which reminds me, the original article this whole thread is about says that Ki Adi Mundi's lightsaber being a different color in a film as opposed to other stuff means that all of that is not canon anymore? No, it does not, it just means Mundi constructed another lightsaber at some point.)

(Further, the author just states 'neither of these are canon'. The entire problem that older Star Wars fans have had with Disney Star Wars is that Disney is exceedingly inconsistent when it comes to what they consider canon and non canon.)

(Ok, I mean sure there are a bunch of other problems people have, some legit criticisms, others very stupid and based entirely in bigoted views, but damnit this is my sperg post.)

(Prior to Disney taking over, there was an entire established hierarchy of canonicity, and now with Disney, they throw out entire huge plot arcs, time periods and characters and world mechanics that were canon, invent new things that break existing mainline and more ancillary canon, and then also mix and match some things that they originally said were not canon but apparently now are, back into their new stuff)

Osha is... either able to do something that has, to my knowledge, never before happened anywhere in anything Star Wars before, or, more likely, it was just done as a visual metaphor with little regard to existing canon, which probably won't be explained.