You know there's more to the story. He had something in the house. Drugs? Maybe he bragged about other things (dumb prepper?)?
Notice that when they broke in the front door, he didn't tell them to hang on while he opened his gun safe, undid the trigger guard and loaded a magazine.
And of course, notice that it's written as no big deal. He grabbed is AK47. So what, doesn't everyone have an AK-47 handy? Had this happened in Connecticut, imagine how evil the homeowner would be described as. How the gun was evil and he had xx loaded magazines at the ready. The story would be about the two evils: homeowner and guns.
Instead, the story is simply the overall facts. 5 invaders. A ready homeowner with good aim, hitting all 5 with 3 confirmed kills. The story doesn't talk about how the 5 guys were 'good kids' and their mommies crying. The 5 had weapons (didn't say what kind) and fired at the homeowner, but apparently even with the element of surprise and advantage of 5:1 in numbers, they still couldn't hit the homeowner. No reason to take the homeowners weapon, he obviously needs it!
And there's other things not written, simply implied. For example the neighborhood is now 5x safer. We have the slogan "Don't Mess with Texas". In this fellow's story, that sure applies.