High IQ and the ability to make stupid mistakes are not mutually exclusive (unless your trying to infer that Satoshi is a complete idiot). Even the greatest minds have made errors it is only human. That being said it would be a completely and utterly stupid move to make all the effort to remain anonymous and use your name as your handle.
Logic fail. If he is rational and if he made the mistake of putting his real name on the original paper, then he wouldn't bother putting so much effort on being anonymous after that, because he is smart and rational enough to realize he already fucked it up.
He tried. He disappeared.