Hey jiggawatts - TPC is the official way to audit benchmarks in the database industry. They’ve been around for a bit, but let me know if you want more info, I’m happy to share more about them.
TPC submissions take real time/$/energy/expertise, so I don't know anyone who has ever done it casually. Ex: It was a multi-company effort for the RAPIDS community to get enough API coverage & edge case optimization for an end-to-end GPU submission on the big data one (SQL, ...), and even there the TPC folks made them resubmit if I remember right.
Also, note how the parent's response did not actually answer 'audited how'. Pushing the work to the questioner is on the shortlist of techniques studied by misinformation researchers. I'm a fan of both companies, so disappointing to see from a company rep.
But: I think it's cool both companies got it to $200-300. Way better than years ago. Next stop: GPUs :)