There is one know issue, it's about user.comment_count ("Posts") which doesn't get updated on discussion delete flarum/core2227
We have another GitHub issue to discuss whether we want to exclude soft-deleted posts and discussions from the count flarum/core2240
The current rules are defined in https://github.com/flarum/core/blob/v0.1.0-beta.14/src/User/User.php#L850-L871
comment_count: all posts of type comment that are not private. This means soft-deleted posts and posts in restricted tags still count.
discussion_count: all discussions that are not private. This means soft-deleted discussions and discussions in restricted tags still count.