If reelected, Donald Trump will "cut federal funding for any school or program pushing critical race theory or gender ideology" and "create a new credentialing body to certify teachers who embrace patriotic values."
If you take a look at this chart from the article you sent, it sums things up pretty well. Bernie vs Clinton was just the blue. If all the liberals voted and all the progressives voted, Clinton wins. Obviously not all registered voters voted in the primary, but it still would have been pretty close. Also I won't get into the fact that Clinton's minions absolutely had their thumb on the scale.
However if you recognize that pretty much all the reds always vote, and the light blues always vote, then that leaves progressives (dark blues) left to sway. Except it's just a matter of how many you can get to show up. IF they do show up, they vote blue. The Dems have to choose between dark blue and light red. They seem to think they can peel off more red than they could ever get dark blue. But they've never been able to peel off more than a percent or two... Meanwhile they basically tell the much larger group of dark blues to shut up and vote for them without ever actually courting them. In the end though... The difference between an R win and a D win comes down to how many progressives actually show up. That's it.
So let me get this straight. Somehow you think that if Clinton went left she'd gain more progressives but NOT lose conservatives/moderates/independents? That is just not the way it works. tl;dr they are trying to thread the needle.
The difference between an R win and a D win comes down to how many progressives actually show up
No, it comes down to how many voters vote for one or the other. As in all voters.
I think she/Biden/Dems would gain more progressives than they would lose conservatives/moderates/independents... absolutely. The types of people who vote for Clinton/Biden ALWAYS vote... And they sure as shit aren't going to vote for Trump or even stay home. They will vote for whoever is the Dem nominee every time. Which means a progressive would also get those votes. Maybe, big maybe, some of the more conservative Dems would choose Trump over Bernie, but I highly doubt it.
So everyone who would vote for Biden, would also vote for Bernie, but not everyone who would vote for Bernie would vote for Biden. The math isn't that hard.
The report you linked to shows what I'm saying. You should read it.
Do you really think there are millions of people out there thinking "well I'll vote for Biden, but it's a close call... If it wasn't Joe then I'd vote for Trump"? Who do you think is actually on the fence between Trump and Biden? No one... The fence is full of people deciding between showing up and not showing up. If we can get them to show up, they'll vote against Trump.
The 2016 primary has nothing to do with what's happening now (other than Clinton getting us into this whole mess with her arrogance and hubris).
The report you linked to shows what I'm saying. You should give it a read sometime. As I did... Weeks ago... Because I do plenty of research. I'm familiar with how campaigns are run.
You really think there's millions of people out there on the fence between Biden and Trump? Like "I know I'm going to vote, but I just can't decide who I like better, Trump or Biden".. or maybe you think there's tons of people who are like "I'll definitely vote for Biden because Trump is such a threat, but if it was someone like Bernie, no way, suddenly Trump doesn't seem like that much of a threat." That just doesn't exist. The people on the fence this election are deciding whether or not to show up at all. If they show up they'll vote against Trump, but the more they can believe in who they're voting for the more likely they are to actually show up.