Do not read that article too seriously! "They do not know" is the best summary of it!
Having found something odd they lack a coherent theory as they have gone down a blind alley, neglecting all electrical phenomena in space for a reliance on the weakest of the so called four fundamental forces. Gravity?
One give-away is that the jet appears to be moving at 4 times light speed. YES! This just means that astronomers have miscalculated how far away these objects are. They are therefore 5 times closer than stated!
Electric Universe and Fractal Universe are far more reliable theories of how our universe actually works!