They seem legit because it seems totally in character for Kaido to invite the Minks to join his crew, not to mention pretty specific descriptions of Neko's sulong (two tails, he uses one of them as a weapon in one hand), a named attack between the Musketeers, etc. Queen going with the Numbers to stomp the samurai also seems viable since right before we got updates as to Jack supporting Kaido. Then after this, King gets an update too as well as BM.
Seems very unlike most fakes we normally get. Last time I brought this up was from the pure dialogue leak we got like 3 or 4 chapters ago from a totally unconfirmed source days early and that ended up being legit.