If the show was circling the drain ever since 30th season started... Well, let's be honest, the show has been circling the drain since the Armin Tanzarian episode, over 20 years ago.
Anyhow, 30th season has been especially terrible, completely focused on pampering leftists with flat jokes that fail to land every single time. Simpsons has always been leaning to liberal side, but it was hard to find an episode where at least one good joke didn't landed. 30th season changed that: almost every episode so far was devoid of laughs. The only exception was the mildly funny episode with J.K. Simmons.
All the other episodes were Lisa heavy overflowing with leftist propaganda disguised as bad jokes or "satire". This episode in particular was really bad, with a history so muddled and confusing, that you can swear from the couch gag that's actually a rerun. Even with a Mt. Spashmore joke from the old days that, incredibly, failed hard to land.
Thanks for reading my rant, and I want to let you know - if you care about - that The Simpsons are dead for me. They died an awfully slow death since "You Only Move Twice" (definitely the last good classic Simpsons' episode), but alas, it's over now. I'd rather not waste my time anymore with it. Or just watch one of the classic first 9 seasons episodes. They're still golden and among some of the best TV shows ever made.