Buffet is most definitely not a person who could simply miss the point of Bitcoin. I'm sure he understands it. Therefore, his statement must have an agenda. Maybe it's a non-obvious agenda, because he's not known to be involved in anything that Bitcoin may directly influence and hurt. But there must be a reason why he says something he most likely doesn't believe himself.
I find it hard to believe people that rich can make judgements this wrong about anything. I think Buffet had a history of saying "I don't understand it, therefore I don't invest", but not discouraging others to invest. It is possible he doesn't understand Bitcoin, but it is a lot less likely he makes a fool of himself instead of saying "you know, I just don't get it, so don't ask me about it".