But at some point he had to gain this knowledge in this space, and it wasn't instantly that he might have thought to make a cryptocurrency. He didn't start from birth covering his tracks.
Yes but he only has to make it so that there are dozens of people who might plausibly be Satoshi. Which, as far as a decade of scrutiny could uncover, he managed to do.
Only from the outset as lay people we don't know who he is. I'm sure his identity is known by intelligence agencies who have tooling that we aren't privy to.