Er, I don't read it as any such thing. I read it as "all evidence available points to this conclusion".
I actually read that as being indicative of some level of uncertainty, and that there's further tests/information that could be gained, or else it would be "As far as can be known" or something similar.
A hypothesis is basically someone saying "As far as we know, gravity is caused by mass" and not making wild unsupported guesses "The chicken came before the egg".
But at any rate, I'm inclined to agree that it's false, since I don't remember anything about crystals in the FS universe. Nor do I remember anything that even suggested that crystals are used for any kind of weaponry whatsoever.