Sounds like good advice, even if worded a little poorly. Burglars aren't assassins, waiting to triangulate your position. Scare them off and no one gets hurt.
It's quite literally felonious advice in most locales. Shooting at nothing will get you arrested for reckless endangerment and your 2nd amendment rights rescinded. That's assuming you don't kill your neighbor's kid across the street with your "warning shot."
And what if the burglars are armed, and are willing to kill? Just because that's not their primary objective doesn't mean that they won't kill you. Sure a gun blast is "likely" to scare them off, but I'm not about to bet my life or the lives of my family on "likely" when there are better options.
If you buy a gun with intent to "scare" people, you've got the wrong mentality and shouldn't own a gun. If they're scared off and run away while you're shooting at them, great, but you don't shoot to scare. Warning shots are for hollywood and potentially riot/crowd control.
As for people getting hurt, if it's a criminal who broke into your house and intends to do God knows what, what the fuck do you care if this person is hurt? That's not to say that you should enjoy the experience, but as far as I'm concerned anyone who makes themselves a potentially lethal threat to myself or my family is no longer someone worthy of my sympathy. At that point they are a threat, and they will cease to be a threat by the most efficient, legal means at my disposal.