Help needed - Busted black water pipe backing into garage

It looks like you can cut the black pipe inboard of the siding wall. You should be able to slide a new piece of pipe onto a repair coupling, inboard, and then attach the final drain coupling to the exposed new pipe. All of this can be done without removing the red siding piece.

I don't understand why the drain hose connector is 5" out from the wall. It could be flush or nearly so and that would prevent just the kind of thing that happened.