This YouTube video could have been a blog post or paper and oh what do you know it was one and it came out a week ago and you’re just now finding out about it? Interesting.
@deersyrup of course I say this after discovering how helpful videos reviewing riichi mahjong gameplay can be to my understanding of hand shape and development
BUT ALSO
I have seen so SO many videos of the sort you're referring to where information is just absolutely shredded in the process of turning the original source into Content™