That makes sense. Also satoshi seemed somewhat unfamiliar with ring signatures but I've heard cryptographers say that they would be well known to most cryptographers. So that also suggests he was not a cryptographer, at least not a full time one.

It is also widely speculated that 'satoshi' may be more than one person, in which case the person writing that one forum post might not be a cryptographer but some other member of the 'satoshi group' might be.