Since the faceplate is screwed into the yoke, and the yoke is screwed into a nonmetallic box, the faceplate would not be grounded, which is a violation of 406.6(B).
Also,
406.3(E)(2) (2023) Installation in Nonmetallic Boxes.
Isolated ground receptacles installed in nonmetallic boxes shall be covered with a nonmetallic faceplate.
Exception: Where an isolated ground receptacle is installed in a nonmetallic box, a metal faceplate shall be permitted if the box contains a feature or accessory that permits the connection of the faceplate to the equipment grounding conductor.
