I am going to assume those GPU sales are AI specific chips and not gaming cards.

A lot of these data centers do seem to be being built with many more planned, either way Nvidia has sold the cards. I don't necessarily think there's fraud involved but simply a lot of demand, speculative or otherwise.

Nvidia's financial statements are externally audited, their inventory is audited and their accounts receivable functions are also audited. I'd put a lot of faith in those audits.