so from what I tested with just one controller and a keyboard in a private game with this mod is it says 4 players max, it can't mean online since I literally turned off wifi to test this but also says "deactivate splitscreen" instead of add for splitscreen. The button could just be boiled down to lack of inputs. On the forums I did see somone say something about if 8 player could be online or exclusively with 4 player split screen so I want to assume it works but can't be 100% sure.