Theymos simply is an early adopter, and a person who knows much about computer science, programming and cryptography in general. It's hard to link him to Satoshi Nakamoto especially since their posting habits, alongside the way they construct their posts is completely different. There had been rumors about that back in 2014-2016 IIRC and theymos just made a good joke about it (can't remember what the post exactly is). If anything though, it seems that Satoshi trusts theymos this much as he handed this forum administration to him.

I guess this is why theymos didn't implement the 'tag' feature for the forum, as he would certainly get a lot of it day by day