사용자 카드의 '게시' 항목에 비공개 카테고리의 토픽이 포함되나요?

yes it does. Most of the posted counts for Team who post on Meta will be like this. I can assure you mine that you see for public Meta isn’t accurate either. Some Team members don’t post in public categories at all, but are very active in private ones. We have a lot of private categories, as well as group inboxes.