I think they’re using “teaching” here in a way neither you nor I would. Because there’s no way they can put any lessons in front of the right students. That’s the algorithms decision. And those signs reek of astroturfing.
I follow mainly therapists and pet behaviorists on TikTok so my take is the teaching thrives through regular user engagement. I can imagine a teacher letting students know they have a page and getting their start that way, too. It has its risks but it's really helped supplement my education.