1st of all, rumor. nothing more needs said there. especially if its only in your head and there is no evidence of it.
2nd: even if its true, regardless of being Eddie's son, he was a kid joining Van Halen. doubt he had much veto power over anything. and if it is true, doesnt it show him more so as having experience with it and not liking or approving of it, rather than being a hypocrite?
doesnt it give the point of view more power if the person saying its bad has actually tried it? if you were forced to eat brussel sprouts as a kid but as an adult choose not eat them, are you a hypocrite, or a grown up that has had experience and is now able to make their own choices? I dont even believe the backing track thing to be true, my issue is the logic used to draw such a ridiculous conclusion that hes a hypocrite, if it happened to be true.