the car does look really beat on and like it has not been treated as an nsx should be treated.
however, at 20K, it may be a very good deal, barring any mechanical issues and a clean title. if those two are in tact, this may be a perfect candidate for someone looking to put some work into a car and save it, TB/WP and clutch was done supposidly, which is a good thing (hopefully), but alot of wear items have most likely been neglected.
i know if i was in a position to buy an nsx at this point (i am not), i would consider this to bring it back into shape. The cosmetic modifications can be put back as the seller has all the oem parts, and as long as your are mechanically inclined, it may be a good purchase...and i'm local too, but alas, i'm still a few years away from being financially able to purchase.
now trading for that supra, i believe the clear answer is NO.