You are talking about some one or group who took great care (including in all their dealings with other early bitcoin users) to maintain their anonymity - which is really hard to do, in the face of the sort of scrutiny that SN has had.
Its at least plausible that, along with the name, other aspects of the SN persona were explicitly constructed.
There's all this myth around who SN is. A lot of people seem to believe SN is a benevolent crypto researcher working in their bedroom, for the benefit of humanity, with no profit motive in sight. I mean, sure, I hope that's the case too, but we should remember that we don't actually know very much at all.