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That site is half hypotheses made up by the author, and half irrelevant things like "this study proves that you won't die sooner if you cut 2 hours of sleep". Nothing in there indicates that sleeping less won't lead to less physical ability.

I only skimmed for references after the comparison with junk food, hunger, and cavemen. It truly sounds like they are making this up as they go along.

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For example all-cause mortality in the linked there biggest meta-analysis is actually lower at 6 than 8 hours (graph[0]) and only slightly higher than at the optimal point. This isn't the same as general ability but it's likely correlated and all the evidence seems to point in the same direction.

0. https://guzey.com/files/books/why-we-sleep/shen2016.jpg

How do we know that shorter sleep causes lower mortality, instead of, say, that better health or some genes cause both?

Even if we assume that correlation is causation, I haven’t seen much of that evidence.

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