I think it is more likely to be an alt of Sirius or at least someone who is known to him. Sirius is the co-founder of the the forum and used to control the domain. It is likely that he doesn't want to be hassled so transferred it to an anonymous alt or someone he trusts.
I also reached to the same conclusion on
my earlier post.
Unfortunately, Nobody took interest/notice on it.
But there some interesting post by Theymos itself in 2014.
I received the domains from an anonymous person who claimed to have worked with Satoshi in the early days. He claimed that Satoshi split up his assets before leaving in order to prevent too much centralization: The SourceForge project to Gavin, bitcoin.org to Sirius, and the two other domains to this anonymous person.
Theymos also claimed that he do not know this anonymous person.
In this context, does "anonymous person" mean that you don't know his identity or that you know it but have reasons to not reveal it here?
I don't know his identity, and it was clear that he didn't want his identity to be known.
In short, not only the creator of Bitcoin is anonymous but now also the domain owner of this forum.