if Satoshi wanted anonymous features in bitcoin so that he could spend his coins then he would have focused on anonymity from the first release but that clearly has never been the case and i don't think bitcoin can ever become fully anonymous. (it already offers enough privacy)
It does in a way, you're right.
There are also mixers I understand
But you can't just rule out a possible and sensible privacy increment just because it wasn't the main focus of attention in 2009-2010
I also should add that the possibility of Szabo cashing out on early mined coins is low, in my opinion. And cashing out on the genesis block, 0.
Signing/ verifying on the genesis block? That's another story.