That is probably a good point. A lot of slips in formulas it seems. Even we are not immune. I just goofed badly in another thread identifying an organic structure!
As for the BASF figure, I would have to do the math carefully but the ratio of 650/450 might be thought of as the ratio of the Dihydrate to Anhydrous. IDK. But, OTOMH it does not look right as the difference is only 36 grams per mole or a difference of about 1.2xxx. The ratio of 650/450 is more like 1.444.