Anyone read the Secret Wars 2015 House of M tie-in? You guys think this is 58163?
It suggests that X-Men existed in the House of M timeline in its original 60s form but was soon disbanded. I thought the original five X-Men were never a team in this reality in the original House of M series, but I guess they never outright said X-Men never existed. If they disbanded early on, then it makes sense that they would not be remembered. It may or may not be that they were formed by the Professor X of this reality though. If it was formed by Professor X, then X-Men battles with Magneto's Brotherhood must have happened prior to Magneto and Professor X's meeting, since the two became allies afterwards.
It would be nice if it is canon, since at least it gives a somewhat proper conclusion to the House of M-verse beyond just a white flashing light altering the world back to 616. The original ending didn't tell us what happened to the 58163 timeline afterwards.