You are correct, a gum "stain" is not really the same type of stain as a wax stain. Only wax stains can be removed with pantyhose. The "stain" you have really equates more to embedding sugar and moisture into a card several thousand times and extracting it several thousand times during dry months. If we did that to just about anything, there would be relevant defects.
Fwiw, Beckett will accurately grade this with only a low score for the "surface".
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