Just out of curiosity, In the picture below, are deleted/migrated/soft deleted questions counted toward this number?
No, deleted questions are removed from that count the next time the count updates (usually very soon after). It's just not very noticeable that the count decreases on larger sites because the intake of new questions kind of covers it up.
Just because a question gets closed doesn't remove it. Only deleted questions are excluded from the count (migrated questions get automatically deleted).