This is kind of a meme for the shows whole run. Every generation talks about how SNL isn't what it used to be. And it's often true. The only SNLs we remember are handfuls of seasons when the show accidentally ran an all-star cast that pumped out iconic skits then went on to become huge names. Then there's decades in between when not much is happening cause there may be one or two great comedians on the cast but the cast doesn't click like when it's at its best.
And hell, The Lonely Island was a cultural phenomenon and they grew right out of SNL in the early 10s so it definitely hasn't been 20 years, maybe 10.
Hahaha. I said something similar on Reddit a few months ago and got downvoted to hell. And instead of just telling me a skit to watch or a show to watch they just told me that I was wrong. So just cuz the show that it definitely gone downhill and is not worth watching.