Those same configuration files he modified define the 2024 features, I don’t think he upgraded them to include any of the 2024 definitions they need to activate the 2024 features, did he?
A model is just a set of triangles with a definition of which of those triangles can move and how. It doesn’t know anything about the features the sim applies. All of that is defined in the system.cfg and flight_model.cfg and now likely other files, too. I haven’t read deeply into the SDK yet.