I don’t believe EMT supports are required to be listed like fittings are, but if they happen to be, then I agree that it would most likely be a violation of the listing.
I’m not sure the definition of a Fitting in Art. 100, could be stretched to include support straps and hangers though.
Even so, I would think that 110.3[A] 1, 2 and 8 should probably be applicable as well as possibly 358.12[5].
