Right, Both this and Steam are random people submitting results which includes people with 3 year old systems.
There is a difference between market share and shipments, Market share includes people who already have systems, no matter how old, this is what a lot of people like to quote and its less than 20% AMD with more than 80% Intel, yes of course it is.... its going to take AMD a lot more than 3 years of Zen CPU's to replace existing Intel systems that exist in the wild.
Shipments of X86 CPU's up to Q3 2020, This is all X86 CPU's sold. in Q3 2020 that was 38% AMD to 62% Intel, so a near 6:4 Ratio, and its still growing, which is not bad at all considering Intel is 10X the size of AMD and its probably better than people think it is. And is you was add consoles to this now i think it would be much closer to a 1:1 ratio.
Thing is as well, it does actually look very similar to the X86 share slide from Passmark. So maybe it is a good indicator.
https://www.techspot.com/news/87436-amd-chipping-away-intel-cpu-market-share.html