Well, I live in Georgia and I have a couple of opinions about this story.
The first is this; I have never heard anybody down here, old or young, describe anything in metric. We do things different down here. The only metric things we use are the occasional metric wrench to work on a car.
The reason most hogs don't grow large in the wild is because of disease. These hogs are not innoculated or wormed, so their mortality rate is greater than a domestic hog.
That said in 30 years of hunting Ga. Hogs I have killed only two around 400 lbs. One of those with a .54. I have seen one a good bit larger, in fact a whole lot larger, but on the two occasions I saw him I wasn't able to get a shot. A buddy of mine hunts hogs with a dog semi-professionally, he's the kind of guy that weighs about 130 lbs soaking wet and live catches all his hogs. He says its pretty simple. Once 2 or 3 catch dogs get ahold of the nose and ears and throat, you walk up behind the hog, grab both hind legs and throw it to the ground. Then you put your knee on the shoulder and hold it down until its all trussed up. Load it on a 4 wheeler take it to a cage and feed it corn for a few months, then sell it.
He has killed one that weighed around 500 lbs and he has access to a couple of hundred thousand acres to hog hunt on.
The article is right about one thing though, wild hogs are a plague. They can have 3 litters a year and quickly overpopulate an area. They do run deer off but mostly its because they eat ALL the food and the deer have no wild mast to eat.
I think a wild hogs aggressiveness is overstated. I have had to climb a tree exactly one time in all these years, after which I started carrying a .44 Mag while bowhunting and have never had to use it. If they smell you first, they are flat "Gone"! And they have an excellent sense of smell.
But, wild hogs are like wild bears. You never know about the individual you run into until its too late.
All in all, I think the story is a fabrication. After all, this place is in the buisness of selling hunts. And the reasons given for shooting it are really fishy. A hog like that could bring a premium price from a hunter. And contrary to beliefs, large wild boar is just as good as young hog if prepared properly. A good outfitter should know how to prepare the game he hunts.
I think it is an advertising gimmick.