Yeah, sounds like they're confusing AVX2 for AVX512. AVX2 has been common for a decade at least and greatly accelerates performance.

AVX512 is so kludgy that it usually leads to a detriment in performance due to the extreme power requirements triggering thermal throttling.

Not really, Intel Celeron/Pentium/Atom (apollo lake) that was made in the last decade does not have AVX. These CPUs were very popular for low-cost, low-tdp quad-core machines such as Intel NUC mini PC.

Edit. Furthermore, i think that none of these (pre-2020) low budget CPUs support AVX2, until Tiger lake released in 2020.