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Just because it's not a true scientific experiment, that does not necessarily mean that it's uncertain.

That said, I'd rather people say this, than that they don't mention any uncertainty at all.

Simply saying "this is uncertain information" does not absolve the use of "truth" and "prove" without qualifiers as the text does.

Except for that mention the text does not act like there are any uncertainty, hence the mention is a simple and dishonest cover-your-ass.