The famous 1990 ad saying "There's no such thing as a Nintendo" https://images.nintendolife.com/16326a1099812/no-such-thing-... does not mention "Consoles". Do you know of any 90s Nintendo ads that do use the word Console?
It was one of those things I could've sworn I saw at the time. It would've been later than that one, and I swear it was Nintendo urging the use of the term console. It could be something else, or I might be misremembering entirely.
Nintendo also referred to their cartridges as Game Paks, another term not used outside official Nintendo materials (including Nintendo Power). Everybody just called them cartridges, carts, or just games. It kind of reminds me of how Texas Instruments tried to get "Command Module" over as a term for their TI-99/4(A) cartridges. It didn't go over.
Oddly enough, the official TI-ism for the 99/4A unit itself was "console".