Not true. The most common wheels are the stock wheels for whatever year NSX. Among those with aftermarket wheels, the most common fitment is 17" front, 18" rear.I dont see going 18/19 although that seems to be what everyone else has.
If you get 18" fronts, get 215/35-18 tires. Anything wider will rub. In the rear, you need to get at least 265/35-18. (255/35-18 is a good choice for 18" rears to go with 17" fronts, on a '94 or later NSX. But not with 18" fronts.)A few people on here have done 18/18 and I dont think it looks too horribly bad, depending on you tire size, that is a 225 in front and 255 in back.