In follow-up, I tried an eraser on a red letter card and (you can see the results below), I feel sun light was used to fade out most the red. Sun light does give a "neat and clean" appearance, not so much with the eraser I used. Most of his missing name cards are missing red names, but a few orange also (83T) . Yellow and then red are typically the two easiest colors to fade via sun light. IMO, using sun light would fade the yellow to white and the red would likely fade to what you see on his cards. Since he is not offering any cards with either a blue or black name (outside of the 80 Pryor) only names printed in red and yellow, it is fairly obvious these are not legit.
I added a 1980 RL card to my window.....
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