Hearing jokes about it and having a reporter turn up from a well-known national news publication seeking an interview are two entirely different things. Really, these are the sort of arguments I'd expect from a surly 13-year old.
If he was some coincicentally named private individual, the obvious thing to do would be to deny being the celebrity Nakamoto, and possibly to advise the reporter to discuss the matter with his lawyer.
In which case he has no reason not to say 'why yes I am that international man of mystery!' and milk it for all the gains its worth, eg TV interviews and speaking invitations and so on. Lots of other people have done this sort of thing, and there's nothing illegal about it, just a social cost if you're caught out. It doesn't make sense to argue that he's shunning the media and seduced by fame at the same time.
If he did that, he'd quickly be found out as a fraud. Being demure is the only way to be a "plausible" Satoshi.
I'm not saying he is or he isn't. I don't know, obviously, but I do know that people do things for many strange and contradictory reasons.
Here's a real world example: Hundreds of people have claimed that their father, brother, friend, odd uncle, strange neighbor etc were the Zodiac killer.
Many such claims came along with a lot more "evidence" than has yet been presented about "Dorian S. Nakamoto". Clearly, most of those claims (or all) are false.
If he was some coincicentally named private individual, the obvious thing to do would be to deny being the celebrity Nakamoto, and possibly to advise the reporter to discuss the matter with his lawyer.