Well, the lack of Avenger X being mentioned isn't that important, because we didn't really get a detailed history of Voyager, just her important bits-- founding member, and stayed around until the Squadron Supreme story.
Furthermore, there does seem to be something afoot regarding Voyager's insertion. Jarvis senses something wrong with her existence. He noted something not seeming right about the revamped statue. Plus, Vision doesn't know who she is (and was silenced before he could say anything). Regardless of what the story will be, Voyager seems to be a recent addition, like the past got changed somehow and suddenly she exists. All is not as it seems.
Or... it's still very possible that she is a villain's stooge planted amongst the team. Solicits mention that someone betrays the team, and an upcoming cover shows the team breaking out of Voyager's head. Symbolizing something?
I agree with Black Guardian, Voyager is clearly not what she seems. As for Avenger X, ugh, she was worthy of being forgotten.