Since the only diffs are the front bumper and lamps, I wouldn't call it gen 2. So no AP would be Gen 1 no AP, with AP would be Gen 1 AP, and this would be maybe Gen 1.1.
I think 1.1 is appropriate since this is significantly less than even Porsche mid refreshes... Like the 991.2 got turbo engines compared with 991.1; which is like akin to significantly new batteries or transmissions system for Model S.
So given that's just a .1 to .2 difference, Model S change deserves 1.0 to 1.1 change.
Or maybe original no AP was 1.0, AP is 1.1, and this is 1.2. Tho the amount of change from 1.1 to 1.2 is decidedly less than 1.0 to 1.1.