Nvidia posted record earnings for 2020 Q3 and is set to do the same again for Q4 so production can't be that slow and the cards must be going somewhere.
This is why monopoly of companies is terrible for the consumer, particularly by Nvidia. They can't resist using the advantage to make huge profits!
If there were 3 or 4 PC GPU manufacturers selling us good gaming performing GPUs, this would never have happened
Nvidia have been battling their only PC rival ATI/AMD for decades, going as far as forcing game devs to make games that only worked well with their cards.