Many people who have a general interest in privacy do some simple stuff to protect it, but don't go overboard since it is damn difficult and tedious to be rigorous in this way.  Trying to put myself in 'the real Satoshi's situation working on a distributed crypto-currency solution (which was not a completely novel thing) back in the mid 2000s, I could imagine hoping that the solution would take off and anticipating it as a distant possibility, but not really expecting it.  Using something other than one's formal legal name would be plenty good for general privacy against google-fu masters, and most people who have been paying attention recognize the difficulty in achieving privacy against the internal security apparatus of the U.S. and won't bother to even attempt it.

It is also worth considering that just as Gavin knows relatively little about Satoshi, Satoshi probably knows relatively little about Gavin.  I could imagine him being a bit miffed about the CIA meeting (though I didn't consider it a real big deal myself.)  If Dorian is Satoshi, then he was also dealing with cancer and a stroke and he would certainly be analytical enough to recognize that the snowball had already started rolling down the hill by 2011 and there was little he could do to influence it even if he wished to.  That would be sufficient to explain both why he would walk away, and also why he didn't really care that much about money which he didn't really need to maintain the lifestyle which probably suited him fine.

Some people can derive enough pleasure from an achievement such as Bitcoin without needing or desiring personal credit.  Just as some people are content driving an old Toyota and would actually prefer it to a new Porche.  This may be hard for some people, and especially younger people, to understand but I can assure the reader that people such as this exist.