Thank you very much for the reply.
In that case as I read it, since I am a contractor in North Carolina and all work was done IN North Carolina (despite the payer being in Colorado and showing state income in box 7), I should be good to include the ~10,000 as NC income for NC state taxes, and not file in CO at all (there was no withholding on it so I don't need to contact Colorado in this case).
Normally I'm pretty clear on the old MISC / new NEC forms but this is the first time I've had a payer include an out-of-state code in box 6 and a state income in box 7 on one.
