Each collecting area has to make up its own mind about the extent or restoration they will permit. Just because it is allowed in paintings or movie posters doesn't mean it is acceptable everywhere else. In the antique furniture market uncleaned examples are more valuable than cleaned ones, similar in the coin world.
Also I highly doubt that the work he does is undetectable. It is imperceptible but not undetectable. Take some of the cards into any undergraduate analytical chemistry lab and you will be able to detect a difference between a card that has been through his process and one that hasn't.
It might take a little more work, but you could also tell the difference between a card that has been soaked and one that hasn't.
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