There lies the problem with the non serial numbered cards, how many really exist? The next question is how should COMC properly list them since they are not true Presidential Editions?
COMC is not making any claims about the print run, so they shouldn't have to make a correction. Beckett doesn't have a number in the "print run" column either (the overview and price section of the set indicate a stated print run of 10). For that matter, nearly 100% of trading cards produced during the first 100 years of the hobby have no serial number, yet people still buy and trade them based upon their perceived value.
If COMC needs to break out every card that has a minor manufacturer's variation, maybe they should have a separate listing if a card is off center or miscut or a bit fuzzy or has a wax stain.