If he is as smart as people claim to be:
1) Wouldn't ever happen (he claimed himself that people should never delete wallets)
2) Gets countered by point 1)
3) That's not a logical thing at all.
If he really is as smart as people think, he would never touch an altcoin.
1) maybe it was an accident, we are all human after all, satoshi wasn't a god, it can happen
2) this will only reinforces the first point
3) i don't think he is talking about an altcoin, most likely completely different than bitcoin, not based on blockchain or something, otherwise it would be stupid for him to build a pure clone...