So says Megan McArdle, in "Every novel might have to pass an AI test soon/Artificial intelligence threatens writers’ livelihoods. It may also remind them why they write" (WaPo)(gift link).
The frozen food aisle is crammed with highly palatable substitutes? I don't believe that for one minute. Strike the "highly" and maybe you've got the beginning of a good enough analogy.
Also: "a car or a cheetah could do it faster" — there's no antecedent for "it." Do what faster? Anyway, it's not that people run the 100-meter dash, it's that other people care about and watch them running. Speed is interesting to us because of whatever it is that is going fast. We also care about and watch cars and cheetahs going fast, but it's not the speed per se that matters. It's the thing that's managing to go that fast. I've been impressed by a fast-moving tortoise.
As for reading, there are different kinds of readers. I don't think I'm the kind of reader who reads the novels that AI is going to get away with writing — conventional, fast-moving narratives with heroes and villains. Does it bother me if readers of hackwork are not getting human hacks? Maybe it does!

