This is a reddit thread where OP claims to have gotten instructions from Apple Support to remove Apple Intelligence.
https://www.reddit.com/r/mac/comments/1wlm6gd/apple_support_...
https://www.reddit.com/r/mac/comments/1wlm6gd/apple_support_...
If you don't manually delete the files, they remain on your Mac until your storage is nearly full.