I see nothing in the defs of Premises wiring, controller, outlet and 404.14 to support a switch being an outlet.
If you say the definition of premise wiring includes switches as an outlet, then EVERYTHING is an outlet..... splices, cables, cable trays, MCCs, NM cable sheath, breakers, bus bars, VFDs, neutral connections, EMT, doorbell buttons, service drop/lateral, meter socket, etc.
Definition of controller does not contain the word outlet, nor does 404.14. Art. 404 only contains the word 'outlet' once.... 404.2(A).
And the definition of an outlet does not refer to switches, IMPO. If you think it does, then I refer you to the second sentence of this post.