You read the script? Old Man Logan had nothing to do with X-23 and Xavier, and viola here we are getting a Wolverine movie inspired by Old Man Logan and it features X-23 and Xavier. Wow crazy right?
And adding Rogue would serve another purpose which is to bring more interest to this movie which I just said. Because as of now, this movie is looking like to have the same level of hype as that Legion TV show, meaning nobody is really asking for this movie to happen nor a lot of people are anticipating it even if the bts word of mouth is good. And if tacking Colossus in a Deadpool movie didn't kill the movie, I don't see why it would be different for Rogue if its executed well.