I mean, this was airing in Japan too I beleive. If not on cable than at least on the Japanese Netflix. The entire "Netflix orginal" thing is just Netflix most of the time putting in just minimal funding to be able to slap thwir name on it for the U.S/International distribution when in fact other people and parties are involved in the studios funding.
These specials still grab Japanese kids and teens attention. Only those kids thatvare invested in Shonen Jump I would suspect.