That likely just means he's constantly changing his opinion on the matter. Yeah, he may think it's impossible a year ago, but maybe he's back to thinking it might just be possible. Hell, maybe he's trying to make it happen right now, but we simply don't know the answer at this point. People said we'd never get DLC, we got Mewtwo. People said we'd only get Mewtwo, we got Lucas, Roy and Ryu. People could say that one of the pre-ballot fighters were the Ice Climbers and you know people would believe it. The truth is we don't know. And until the fat lady sings and they announce that there's no more DLC for Smash and Ridley isn't in that lineup, we won't ever know unless he is confirmed or not.
It's fine to be cynical, but honestly Sakurai is so wish-washy on Ridley that it's hard to take anything he says on the character at face value.