I agree that it’s weird that the damage boost from Electrified Plating (and Razor Armor or Spiked Armor) is fully applied at 1 Attack, and then non-existent at 0 Attack, particularly in the case of having your Attack stat lowered rather than being Entangled (although effectively the same thing).
There was another topic that discussed this a while ago, which seemed to come to a begrudging resolution that the behaviour is consistent enough with the wording (“Add X% of Armor to Skull damage”), since if no Skull damage is done, no Armor is added.
If we remove the qualitative judgement of “no Skull damage” (or “Skull damage didn’t happen”) from the number 0, and treat it simply as a number that’s part of a formula (as in, "Skull damage did happen, and it was equal to 0), then it should reasonably be able to be argued that Skull damage will be equal to 0 + X% of Armor.
I’m not sure if having the stat lowered via Wild Queen or similar (Elemaugrim, Sylvasi, any other Attack reducer) compared to being Entangled makes a difference, but here’s that previous thread:
As you may be able to see from the threads there were a few disagreements over interpretations of the text.