I've written to Gibson Customer Service about this, pointing out the obvious errors. To Benton Cummings' defense it could be that he only received the serial number and the fact that "it is a double neck" from the seller when making his (brave) assessment. The EB-6 might indeed be and probably is from 1963/64.
Still, considering how much their brand name and legacy supposedly means to them and how they bank on it even today, you'd wish they'd put more care into their assessments.