The M-line music channel does regularly put up Youtube shorts.
When it comes to OG Youtube channels Fujimoto Miki also posts quite a lot them.
I personally would like them to be more active on Threads.
A number of OG's make good use of it (Katsuta Rina for example)
Especially now that almost every quote or reply to a post on Twitter is a pornbot or cryptoscam.
Former UUG(2) Nakagawa Chihiro has basically made it her primary social media account.
EDIT: Huh, just checked. Even the H!S channel has shorts.
This one has 2.1 million views.
https://www.youtube.com/shorts/DbezYNlDlb4Goes to show how I don't consume any kind of this shortform content to not even have noticed it exists.
The only time I ever see a TikTok is when someone puts it in a Tweet.
EDIT 2: Rereading that last sentence gave me "what the hell am I doing with my life" vibes.