To follow up on your train of thought:
2021 Swing visual:
2022 Swing Visual
Not hard to see where the gap is. He's objectively worse in all of the Heart, Shadow and Chase zones. Heart: swinging less, taking more. Shadow and Chase: Swinging more, taking fewer pitches, and the ones he is taking arent the ones he should be taking given the -7 run value in the Shadow zone.
It may partially explain the uptick in grounders if he's swigning at more of the pitcher's pitches, but probably not the whole story as far as the grounders goes.