First line support orgs are generally terrible. They are designed to filter the volume of support requests down to the minimum possible. Basically they’re the support equivalent of the executive PA who will block almost all incoming calls to protect the time of the CEO.
Sounds like you got to second line (an actual support engineer) but still hit the wall of ‘here’s the standard answer’ and ‘computer says no’. You’d probably need to escalate to third line to get to someone who would really dig into the problem for you.
Ultimately, though, you solved your problem yourself on your own time and at your own expense, and that’s really the outcome that I suspect nVidia would have preferred.