The Coyote 5.0 V8 is a hybrid engine with BOTH direct and port injection. Neither squirts fuel into the oil, k=just the cylinder. If fuel is getting from the cylinder into the oil, then you have a failure of the compression or oil rings. It's about the only way for fuel to get to the crankcase. The valves are overhead cam type, so i ois unlikely they are the source of fuel, but it COULD be. Maybe an intake valve is leaking badly, bringing too much fuel into the a cylinder.
Probably needs a teardown to confirm the source. Good luck!