Comments were based on the merits of a few NSX owners that mentioned that if the FD was reliable they would have gone with the FD instead.
That adds IMHO.
Everyone is entitled to their opinion.
I believe those comments were made in regard to a purchase of a used NSX versus a used FD. I interpreted your NSX sales comment as applying to the sales of new NSXs, correct?
Given the few years that FDs were sold in the US and the price differential, as well as the fact that the FD's reputation did not materialize immediately but rather developed over time and mileage, I doubt very much that a more reliable FD would have impacted new NSX sales from 1993-1995.