No, thats not why he got mocked.
He was saying Amazon is useless because Switch can dominate in the rankings but actually be only slightly ahead in actual sales.
Many people tried to explain to him that Amazon has never been a good indicator for actual sales, just for placement.
He got mocked for a few things and some rightly so. But he also got mocked for stating that Switch positioning on Amazon doesn't truly reflect how well it's doing. I think he even though he explained himself quite well.