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JimBI tend to agree with John B. California. While I am sure some altered cards have slipped through, to say or imply that most high-grade old cards in PSA or SGC holders are altered is, in my opinion, a reckless, unsubstantiated generalization that does the hobby no good.
And it is not true that they were not around before. I recently picked up a load of old Trader Speaks from the '70's and early '80's. I have been drooling at the prices of old T and E cards listed as NM or Mint. They were there then.
JimB