Talk about missing the point completely… I don’t even know how to respond.
My Tesla is powered by Intel and my Switch is powered by Nvidia but it doesn’t show up on the steam stats either.
The point is, the Steam Deck will have a negligible impact on AMDs revenue or steams install base because it’s a very much niche product for enthusiasts.
In regards to what is relevant to this thread i think its important, looking at AMD market share from a perspective of Windows devices only gives you entirely the wrong perspective of AMD's X86 market share, IE that they are tiny insignificant cog in the machine.
And i'll tell you why it matters, Intel use this chart to peacock their X86 marketshare prowess constantly.