Not going to even bother reading the article. Considering that even a 4070 just barely gets above 60fps on medium or high settings on most new games, we're just not at the gpu horsepower to hit it yet. If a $900 gpu is struggling to make 4K, it sure isn't 'mainstream' ready.
Hell even for movies, we don't really have full 4K adoption yet. Sure your prestige shows are now 4K (Rings of Power, Disney/Marvel premier content, etc) but tons of new-newish Netflix shows don't even stream at 4K still.