They still copy-pasta'd the quote (and some others) from the daizenshuu entry and pays note to the Daizenshuu giving the SSJ multiplier as 50x. As such it isn't entirely invalid. Hell, there's a Daizenshuu on anime movies and areas of GT such as explaining why Pan isn't able to go Super Saiyan in it.
While I don't care for the GT multiplier debate either way, since Golden Ozaru is literally SSJ + Ozaru and one of SSJ4 Goku's attacks is a 10x Kamehameha (which is also the multiplier for the Ozaru form), it isn't totally out of the ordinary that people would derive multipliers for the form.