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As silly as it looks, there's a good reason for this. You can't just have a blank page because the user is going to wonder if something is missing. You have to say that the page is blank on purpose, at which point it's no longer blank. They could say "The only thing on this page is this sentence explaining that there is nothing else on this page" but that seems somehow more ridiculous.
I have also seen 'this page intentionally left blank' which i feel is slightly less confusing
Same here, seems almost like a standard phrase.
But what's the purpose of the blank page?
A piece of paper has two sides but not all text needs two pages.
Similarly, most books are printed in signatures. Several pages on one sheet printed on a press, then folded and trimmed and then bound to make a book. A signature almost always has to have at minimum a 4 page signature.
It's a common convention for chapters to start on the right page, check a physical book