But M5 can also go to Charleroi's central station, yeah?

This map is made by the PR (Public Relations) and not by the exploitation.
Only when this branche (Le Vivier) will be put in service, then we'll now what the exactly route will be. Everything is possible. The region doens't have money (trams doesn't run after 20h!) and by example, it's possible to let M1 run to Petria (and only M2 to Anderlues) and to make 1 route as M5/M1. Many options are possible, nobody knows what will happen (or not).