The current example code for the dimmable LED is calling the MyMessage data value directly. Make sure you change this line: https://github.com/mysensors/Arduino/blob/development/libraries/MySensors/examples/DimmableLEDActuator/DimmableLEDActuator.ino#L88 to

int requestedLevel = message.getInt();

So that it is properly using the getter. I don't know if hek was going to make the solution more elegantly, but at the very least that example code will need to change no matter what he does to the library.