When I hide comments with mentions, will the user still be notified?

Yes, when you hide comments that include user mentions or tags, the mentioned person will still receive a notification because CommentGuard processes comments after Facebook delivers these notifications. While the comment will be hidden from public view shortly after posting, it remains visible to the original commenter and people directly involved in the conversation. This means the person who made the comment can still see it, as well as any replies to their hidden comment, even though it's invisible to the general public.