Managed to find the source thanks to a post on rddit :

https://www.reddit.com/r/perfectlycutscreams/comments/197gvd1/perfectly_cut_inflation/

Ytb channel (full Japanese, no eng sub) :

https://youtube.com/@ibuyohesquash

Video :

https://m.youtube.com/watch?v=p33XIgCTXGU

Is this the onion? They add the basic feature of a media player where you can listen the title you clicked and not random stuff? If I understood correctly, this is not a feature, it’s just a restriction being removed

Same, both thumbs bend backward to 90°. Used to have fun back in school, saying I’d always got my set square with me for geometry.