Precisely how do you define definitive so that we might better understand what you assert to be wrong?

My naive intuition suspects he knows, so here's a contrarian curveball pulled directly out of JEDEC JESD88 Dictionary of Terms for Solid-State Technology[1] to consider (my emphasis):

> drain power voltage (VDD): The primary power voltage on MOS devices that require a potential that differs from the normal system logic voltage. The term VDD is used interchangeably with VCC on devices that use 5‑V supplies.

[1] https://www.jedec.org/standards-documents/dictionary/terms/d...