The fact of the matter is is that Sakurai is generally untrustworthy. And even if he was right at that time, Nintendo could easily override him, as they're the one's doing the DLC.
And there lies the problem; If Sakurai was doing the DLC, then I wouldn't even really question it. But this is Nintendo we're talking about. If they had full reign on Smash they'd only give us Mario, Zelda, Pokémon, and Fire Emblem characters. I honestly cannot see them adding Porky, a dead character from a dead series, which third game has never and likely will never be localized in the west.