steam hardware survey isn't affected very quickly by current sales
It's also not accounting for things like the absolute flood of N100 mini pcs (since they're typically not gaming rigs) that sell for barely anything compared to the cheapest AMD offer. Granted they also suck, but Intel seems to have really invested themselves into the Chinese style quantity over quality, selling lots and lots of cheap crap which will influence any sort of percentage survey massively.
Iirc, the Nvidia 1000 series gpus were still the most common ones according to the stream survey even when the 4000 series was being released. And when Ryzen was first released, there was still a sizeable fraction of steam users on core2duo processors.
The delta this month was +1.2% for AMD, so would that imply that 80% of people bought AMD, and 20% Intel? In August AMD seems to have actually had negative delta, maybe from people selling the effed up 13/14th gen for cheap? Idk.