OK,
One of the beauties of GLS is that it is a signal, not multiple beams. The signal can broadcast whatever you tell it too, even curves.
If the OAT gets too high, ATC can clear the ac for a different channel with a GP of 2.8 instead of 3. This is important with CAT III autoland.
Right now, most GLS procedures have 5 channels set up with different GPA's. (when I say most, that means the ones I have designed) (2.5,2.8,3.0,3.1,3.5)
This was to account for aircraft types, and also be used for temp extremes. Heavies are brought in at 2.8, while mediums at 3.0, and lights at 3.1 for wake sep. (guess a bit too much forward thinking there)
So, that is how temperature can be addressed.
No fly zone, yes, exactly, it appears they turned to short final 1000 feet high, theres the GA right there.