Tbh a bunch of rumors say Episode Arceus, and it makes sense to happen. This particular leak though feels fake because GF literally doesn't care lol. They're removed from their own fan base and don't give a shit about criticism that hasn't been made into a meme and spread on Twitter to ridicule them. They know people will buy it as is and it's good enough for them.

Now the Platinum bits being DLC DOES sound like a douchebag move they would do because, like the dex cut, they could add some (not all) back and say "Hey we listened! Give us more money$$$!" But I think these games are probably gonna be one and done since most gens last 3 years so they can keep the commercialism train going. XY to SM was 3 years, SM to SwSh was 3 years, so on and so forth. Unless it's day 1 dlc anyway.