I don't think he is living under a rock. There is a lot of people that don't know about the Surface Pro X using ARM or MS even dipping their toes in it, they were terrible at launch and no one really even talked about it.
It is a thing, ARM will be taking over, it just won't happen very soon. Apple has introduced it with the M1, with great fan fare, the MS Surface, not so much. MS is using its own ARM design, while it is a step forward from its initial design it is still lacking in performance. Apples M1 has done extremely better and users that have them, love them. Pisser is it is Apples first one, low budget and it is doing really well. It will be interesting to see where they go with the next gen.
Once MS gets its act together, games for ARM will take hold more and more. As of this writing, most software designed for Windows still doesn't work, or works very poorly. MS needs something like Apples Rosetta 2 to emulate x86 better than it does until software devs port more and more into ARM.