I do think there's kind of an element of truth to this, though it feels very broad to say so. American absurdism does exist, just maybe not as much on TV? Screwball comedy is very much a thing in film, and occasionally reaches for the same feeling.

Stuff like Airplane! or some of Mel Brooks' stuff or National Lampoons movies, and later the "Scary Movie"/"Teen Movie"/etc. things... but it's like when they go much deeper than an average SNL sketch they almost always go too far and suddenly reach into trying to offend or anger or even disgust (though the new KITH has a bit of that too).

Adult Swim has a lot of American absurdist humour, like Tim and Eric, The Eric Andre Show, Rick and Morty, etc.