Good points lots of people forget to look in 110, but I'd say DBZ prevails110.8 Wiring Methods. Only wiring methods recognized as
suitable are included in this Code. The recognized methods of
wiring shall be permitted to be installed in any type of building
or occupancy, except as otherwise provided in this Code.
400.10(7) has now recognized cord wiring method so 110.8 is met and nothing in 422 is overruling 400.10(7). 422 would need language saying a cord is not permitted unless..I would cite Article 400.10 (7) claiming the prevention of vibration. I know my disposal shakes my whole sink.
I have seen a disposal wired with just a whip of NM cable get called out and flagged but not a hard wired cord, though it would have to be one of the cord types in 400.6 and not some unmarked cord. And sized per 400.5.