If he opened his mouth and the words came out i'd say it's canon. Though it's all ultimately make believe anyway.
I don't think the comics really fit into the continuity of these two films for the simple fact that a lot of stuff happened in all of the comics that is basically squished down into a year. A lot of crew also died in various missions. Including Gary Mitchell.
As far as the films are concerned they seem to be fairly isolated into their own continuity.