Atticus Ross and Trent Reznor's scores are usually on point and give a true identity and vibe to the films they're scoring. That was absolutely the case with Challengers, which I thought was a great little film (not year defining or anything, just a solid all-around good film). I'd say their work on Challengers was more inventive than what Zimmer did with Dune 2, which is in big parts re-hashed from Dune 1 (in fact, the score for Dune 2 isn't even eligible for the Academy Awards because it exceeds the Academy's rules on pre-existing music).
Their work on the recent Watchmen TV show was also awesome.
I like Zimmer's work on Dune for sure and it wouldn't have been scandalous for him to win it, but Challengers' score is genuinely great and is a worthy winner. It's definitely not "bullshit" like you originally stated.
I'm excited to see Guadagnino's Queer is also scored by Ross and Reznor, hopefully I can go see that tomorrow; after Bones and All and Challengers, seems they have a nice little collab going on with Guadagnino.