Basically - yes. Many local jurisdictions interpret the NEC to require UL (or other "independent" test lab) approval on any product or equipment that has established UL standards.
In some parts of the US, this routinely includes control panels (UL 509).
If this was caught during a plan check, prior to fabrication of the equipment, count yourself lucky. Mostly it comes up after the panel is installed and ready to energize and an expensive field certification/retrofit is required.
