I've lived in New Mexico all my life, and although we refer to "the south valley" of Albuquerque, there is virtually nobody who considers it a separate city, even those who live there. "Census designated place" or "unincorporated town" notwithstanding, this should not be considered a city for the purposes of this quiz.
Yeah, I suppose you're right. On a very old previous iteration of this quiz we got a lot of complaints asking for Los Alamos to be included. I think it's better with CDPs off the list however.