No, it's the movies
I've taken to always using closed captioning when viewing at home. I stopped going to theaters long before COVID. I can't even remember the last movie I saw in a theater. I prefer the couch and the pause button.
I came across this recently:
https://www.slashfilm.com/673162/heres-why-movie-dialogue-has-gotten-more-difficult-to-understand-and-three-ways-to-fix-it/