[drcy]

The amount and type of restoration is relevant to judgment and valuation. Not all restoration (in amount and type) is viewed the same. In fact, if a card (or anything) is too restored, it may not be considered an original, or entirely original, item.

It just says that the AUTH grade is one indicator and doesn't, and doesn't proport, to say everything. Should an AUTH grade say more-- such as the type and amount of restoration or alteration, or why it wasn't graded? That's an argument. On the other hand, the AUTH grade simply says the card is authentic-- and in fact some unaltered cards do get that grade.