I was about saying same. Dude is most probably a well articulated individual and had all his plans premeditated. He forsaw a problem that can be used effectively in the dark web and thus transmitted into the surface web to create money transfer solution. He didnt want the glory and name so he published his invention and went anonymous which is one of the best decisions ever made for cryptocurrency survival and adoption till recent date
Which is the main reason why he really vanished, and it really happened. Satoshi has been most wanted during the early age years of Bitcoin, as they think he is the one promoting dark web too, so he was afraid for his life, he doesn't want to risk as he has for sure family that he should take care of, anyway, still a great job for him as he have foreseen this event, he was really a genius.