Well, in the same way that a pairing with a Boy x Genderbended Boy (Now Physically a Girl) would be considered BL in a Mental Level, then one with a Girl x Genderbended Boy (Now Physically a Girl) could be considered GL in a Physical Level.
After all, this aren't subjects that can be all thrown into the same bag that has always been used to describe sexuality and gender while ignoring anything outside the standard.
So, taking into consideration Mental and Physical when talking about BL and GL is a nice touch in my opinion.
It recognizes the identity of the person, regardless of what fate turned them into against their will. Or even by their own will, if they are into that.
....Well, I say that I like that it recognizes their identity, but I'm pretty much into forcing the genderbended dude into being a girly girl, especially if he truly HATES every moment of it, but that's on me XD.
I can like both!