I italicized real each time because yeah, WoW can be social blah blah blah, but at the end of the day those people you were playing with chances are you will never build a relationship outside of WoW (though it is a possibility you could, im not disregarding that) and your boundaries are questing raiding and pvping with your said 'friends'.
Best way to put it, WoW friends help you progress your character and be more social within the realm of WoW. So in WoW, yes you are more social, but anything outside of it your online friends will not be able to help you be more social or progress your real life struggles and responsibilities. Real friends will help you become more social in the realm of the real physical world, which can make you more sociable both in the physical world, and in WoW (since WoW is after all, a production of the real world, surprisingly.)
Also, yes all video games are a waste of time, but the way WoW is, and he explains it in his video right at the very end, WoW makes you more addicted the more you play, and don't even try to deny WoW isn't addictive. His example put it best, no one put in thousands of hours in Super Metroid trying to collect every item/etc.
I agree 100% with everything he said.