It is a nice observation and many people have claimed Nick to be Satoshi in past, but it will take more than a word/phrase to come to any concrete conclusion here.
Not that easy. It may just intensify the already-believers.
One must not assume anything without concrete evidence, this Nick Szabo is a very prominent thinker though and I enjoy reading the things he's posted about.
One thing that runs though my mind from time to time is that possibly whoever created Satoshi, may have also been the creator of NXT. Maybe I am mistaken but didn't the creator of NXT also disappear into the outer reaches as well?
If Satoshi was still around for some time after leaving Bitcoin, I don't think he could keep away and it could be where he's been a part of a few different Cryptocurrencies under anonymous pseudonames.