I don't think it will bring that kind of money either; that's just sellers/auctioneers trying to get rich off gullible buyers with more $$ than sense at these large tv collector car auctions..
The controversy over the 'color' was just that, a difference of opinion between 'evaluators' 45 yrs later attempting to judge what color was sprayed at the factory, and the owner who paid for it to be done, and the salesman who wrote up the order for him. The issue is whether it was actually evening orchid, OR another very similar GM color. There is no issue as to the fact that it was a special order paint (I don't think.. it certainly isn't in my mind as the original owner told myself and several others many years ago that he had special ordered such a car for his wife - JohnZ was involved in that discussion at Carlisle Vettehead tent, many years before the car was found and restored)..
I do think it is a very special car due to the 'special order paint' (and the story behind it) which adds some value to its 'restored real Z28' value, but to me that 'extra value' would not be $150K..
if you HATE the color, it might even be worth less than an equivalently restored red, orange, or silver car...