Is there a source for this debunking?

And can moons have moons? https://academic.oup.com/mnrasl/article/483/1/L80/5195537

At closest approach, I wonder how high you'd have to launch/propel something for it to leave the gravity well of your tiny moon and be sucked into the terrifying vortex of the gas giant. (Come to think of it, how weak would gravity seem on a moon no more than a couple of miles across? How high would you be able to jump and how long would it take to float back down? The mind boggles!)

Okay, dumb question . . . with that many moons in that many different orbits, how can none of them pull another out of orbit and cause collisions (that we would presumably detect from Earth)?