Means nothing. Dorian could've just logged in and posted that.
Except by doing that, he risks confirming that he is Satoshi.
To whom? He is not videotaped at his home - I hope? - and if he is Satoshi, he knows how to log in without revealing his IP address.
The only thing it reveal it is that Satoshi - or somebody having access to his P2P account - is alive. Not breaking news, imho.
The strange part is - why Satoshi would not use his PGP key? Of course, there is no way for Satoshi to convince us just by posting he is not Dorian - but at least we would know that the person reviving P2P account was Satoshi - and that he is still following (bitcoin?) news