I can't imagine why it would count as a permanent duty station, given what you guys are saying about USNA and ROTC grads' time at their respective campuses not counting as a permanent duty station.
I may be misunderstanding what gtg means, but ROTC and Academy have never (in the last 10 + years) counted as a PDS unless you were PCSed to their for some reason. The only reason would be a med hold. I had this happen to me, so I got PCSed to API, but otherwise your orders to flight school (for non-priors) are appointment orders and not PCS orders, which is why your ROTC/Academy is not your PDS.
If I'm misunderstanding the statement, then disregard, but the above is true.