Thanks for posting the link to the story. I haven't seen it before and enjoyed reading the article. While I can't say if it's a true story or not, I always have my doubts when they get to a certain size. This one is well over that size where I start to question things.
National Geographic did a really good, in depth show about wild hogs. One of the things that they covered was the ability of a wild animal to grow to extreme proportions. Especially how unlikely it is since they would have to find so much more food then the other animals competing for food, then it's size would hinder it in surviving in the wild due to it's need for more food then the other pigs. What they did say is that domestic hogs can easily get that large, and larger. Sometimes they escape captivity, other times they are released on purpose.
Maybe the story is 100% as the hunter knows it, but my guess is that somebody raised that hog and force fed it to get that big. Of course, that is if the photo is real to begin with.
Eddie