1990 clear coat vs 2015/16 clear coat. My money is that the newer is better due to material advancements and not being 2 1/2 decades old.
Honestly, anyone who would give a shit if it was NOS would easily know the difference. I personally don't see an overt attempt to deceive. Possibly just laziness or ignorance. I think it's time to put the torches and pitchforks away.