I wouldn't be surprised if Satoshi is indeed a time traveller. So he went back to 2009, created Bitcoin, mined about a million of them for himself, and went back to his own time. The big question now is when that is! It could be years or even centuries from now that his old Bitcoins start moving to new addresses.
Nice story! Still, imho if this would have happened (or will happen) then I'd expect:
* he would have also provide(d) a solution or explanation for the network congestion and for using Bitcoin for "paying at the grocery store", maybe even something better than LN
* he wouldn't have allowed the jackals get to come so easily with their claims about being him or having "the real Bitcoin"