I take a different view to the quote. It's one man's opinion, but he doesn't speak for the hobby at large, and I don't think he's saying anything that isn't common knowledge. It has been well known that grading companies don't have a great track record with altered cards, including the most famous card in the entire hobby, the Gretzky/McNall Wagner.
I don't have to accept altered cards in my collection (and won't), and I have probably passed on legitimate examples in my efforts to avoid doctored cards. To me the holder and assigned grade are a helpful guide, but I revert back to the same old maxim; buy the card, not the holder. Regardless of what the slab says, if I'm not sure the card is original and unaltered, I don't buy.
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