As this is the Onion, chances are the "author" of this article is completely made up. He's a character, and since this is print, anyone on the Onion staff can write for this character. So whether it was the same person who wrote all those other articles, it's possible, but not necessarily the case.
And whether the picture is actually of the same person who wrote the text is highly doubtful. Just look at some of the other regular columnists and you can see that they are all made up characters. Many of them extremely pathectic. If you were to write a satire of a society article from the point of view of a clueless over-weight girl who everyone hates, would you use your own picture in the header?
Maybe some of you aren't completely familiar with the Onion. It's all fake. Before I knew what it was, I read articles on the site from time to time, and because of their extremely straight-forward nature I was mislead into thinking several of them were true.
It's a joke. It's not real. It's just humor.
Although, sometimes it does hit really close to the truth.