There’s a difference between satire and mock-being-a-terrible-person. Although it gets a bit too salty for me at times, I “get” the Onion’s humor and think it’s frequently rather funny.

Has satire merely run out of new things to deconstruct that folks are turning to absurdist humor now?

I think that line is pretty thin. I also think in a pseudonymous web forum it rarely comes across as intended. We often need to know the author or have access to owners information to “get it”.