I don't think this deconfirms anything about the leak. First of all, even though we know who will be revealed, Sakurai probably wants to keep characters a secret until properly announced. Notice that Game and Watch, ROB, and Duck Hunt Dog aren't in the timeline, in the eighties section where they would be had this roster be complete. What the PotD is probably showing us is what All-Star mode looks like when you first boot the game. Secondly, it's like Melee where you have to play for a while to get very character, so the only thing that this proves is who will be unlocked from the start. Duck Hunt Dog is locked as a hidden joke character kinda like R.O.B in Brawl.
Off topic: I like how the recovery items are from different games rather than all Heart Containers.