That phrasing is bad but I get it. Like, if this was a Solo movie starring Harrison Ford I think it would have done great (the plot would have had to change, obviously). A lot of character appeal is from the actors, so just doing other stuff with them isn't going to have the same level of interest. It might have done well as it stood if it was released right after TFA too, but a prequel with a different case answering questions no one had wasn't a great bet.
I'm really curious what their end game is with CGI Luke. The more they use him the more I think they have big plans but, like, I'm not sure how scalable that is. Feels like it'd be easier if they got a show out that was set when Kylo was young, they could just have Mark then with some de-aging tech.
(For the record I adore Solo and would have loved a sequel)