Putting aside issue of him admitting to using GPL'd code (which clearly makes him fall under GPL rules), how can this apply if he himself is not selling code linked to WP?
He is selling a template, the user is the one who links it into the WP system. If he distributed WP+the template all in one package I think you could say it was linked, but as it stands he is selling stand alone software that won't do anything until it becomes linked into the WP system by the end user.
So technically he's just distributing software he wrote (besides his copying of code) that itself is not linked into any system. Then the user takes that code and links it in. So isn't the end user the one who is GPLing the code (maybe in violation of the template author's policies?)
Geeks clone themselves, it provides the same benefits without all the hassle with women.
It seems you made a mistake in your post, I've gone ahead and fixed it though.
A morsel of genuine history is a thing so rare as to be always valuable. -- Thomas Jefferson