It was best if he didn't. Seven could likely rationalize his awareness with her advanced mastery of multiverse theory and how one person's reality could very likely be another's fiction, but in the end, it would bother her that other people knew so much about her when she still hadn't figured her own self out. There were things in her head that she didn't share with others — the things she did as a drone, that which she recalls from her abrupt childhood, and so on — that she keeps closely guarded. Things she would not take kindly to virtual strangers having knowledge of.
"Deep Space 9 is located here, in the Alpha Quadrant. My vessel was not."