That TOS/TAS just always happened to feature Augment virus Klingons and all other shows happening to feature normal Klingons can always just be written off as a bizarre coincidence.
Sure, but equally, we needn't assume that
all the humanlike Klingons we've seen are
purely the result of the Augment virus
alone. (Indeed, Tyler clearly isn't, and neither was Arne Darvin.) Personally, I'd prefer to have the situation back the way it was left by "Trials and Tribble-ations" (DS9), and
keep it that way, with the difference explicitly acknowledged, and
multiple potential explanations that aren't mutually exclusive of one another implied. Leave enough ambiguity that viewers and future writers can choose which they prefer on a case by case basis; or equally,
not choose. Let it remain something we have some tantalizingly limited insight into, but can't quite pin down definitively. To me it seems they've already gone a fair ways toward this end...we'll see what their next move is soon enough. Maybe they will indeed come up with a "definitive" answer to the riddle, or maybe not. Perhaps it will be a satisfying one, or perhaps not. I have a totally open mind on the subject at this point.
In any case, I'd caution that as things stand, we might well take care not to
presume too much as to what exactly is "normal" for Klingons in any particular period, if there even is such a thing, as we have somewhat...conflicting reports. But conflicting observations are not necessarily contradictory, nor are contradictory ones necessarily incompatible, so long as there are parts of the big picture that we don't have. And there's
always room for those. Or ought to be, IMO.
Literally the only thing that could break this arrangement now is if Kor, Kang, or Koloth showing up on Discovery with ridges.
Even then, we could always say they tried one "cure" and it didn't stick, so later they tried another that did. Or invent another scenario entirely. Continuity is far more bendable and far less breakable than many fear. (Or hope, for that matter, if that's one's thing instead.)
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MMoM