is Theymos not Satoshi?
No. Look at some of theymos' early posts, he was a clueless Newbie back then

Anyone can pretend not knowing something, so that is not a good argument but anyways, I believe that he is not Satoshi. By the way, it's still a mystery for me, how he became the admin of this forum. Someone doesn't create a gamechanger currency, buys domain for it and gives the ownership over the community to a random stranger guy online.
What I have wondered about way more frequently is how nobody has apparently been able to identify Satoshi in this day and age--it seems impossible that someone could disappear without a trace like he did, and I'm pretty sure at least one government would be very interested in finding him, and probably way more than one.
Maybe he spent the last decade in prison already, waiting to give up his private keys.... And that's my best-case scenario, in which he's still alive. Why else would anyone disappear like this after creating the biggest invention in finance since .... since sliced bread

I have two possible explanations:
1. Sadly, he is dead and that's the possible explanation of why he didn't touch a million Bitcoin for over a decade. This is sad and I think the most legit answer.
2. He is one in a billion man who stands strong to protect Bitcoin at all costs. His aim was the true decentralization of Bitcoin without trusting 3rd parties and for this reason, he cut himself from Bitcoin for better but left an ACE in his hands, i.e. one million Bitcoin. If the decentralization of Bitcoin gets significantly affected, then Satoshi will come out of nowhere and make a big changes with his one million Bitcoins in hand.
I can't really find the best explanation to the situation that happened around Satoshi, this is out of human's capability. Secrets are always revealed but in case of Satoshi, it still remained a secret and that's what I can't explain, that's impossible accident that somehow happened.