This is arguably one of the silliest things I have ever heard.
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Do you revert to your average size over the course of your life?
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Is your soup served at the average temperature of your meals last week?
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Historically people were much shorter on average a few centuries ago- our nutrition and health has improved and we're a few inches taller. You don't see people reverting to the 'mean' height?
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Why should life approach some 'average' from a few hundred years ago?
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The law of large numbers states that if you take a random even (flipping a coin) and repeatedly observe that SAME EVENT, your observed probability will approach the actual probability (50/50).
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These blatantly wrong 'counterexamples' make the page hard to take seriously.