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PCAre your cards variations, or print errors?
I think the "missing red ink" T206 cards, like Fred Beck and Beals Becker, are considered variations, as opposed to printing errors, and that's why the designation appears on the slab.
I don't think PSA or SGC will specially label every card that is missing a color. Why the distinction? Not exactly sure, but perhaps there are enough "no red ink" Becks and Beckers out there for collectors to pursue, and therefore it made sense to designate and checklist those as variations. Whereas, your no red ink T206s may be unique.