The article says “from the center” of a Black Hole, clearly nonsense.
a) The ejecta occur very near, but not within, the Schwarzschild radius. b) Even at or slightly inside the boundary the escape velocity is not quite superluminal because of quantum effects (actually “velocity” has no precise meaning in QM.) One manifestation is Hawking Radiation.
And I think superluminal sounds a hole lot better than supersonic, ya hear? ;-))
OK, smarty pants, I see your light on, go to sleep. ;-)