I would say mission accomplished - they got a whole article on your site for free while they would otherwise have to pay quite a bit to get a featured article.
First, this is news. We deemed it fun / newsworthy. Nothing more, nothing less. It's almost like we write articles that we think people might want to read! Will this succeed? Perhaps not, but it wasn't a ton of work to get it put together and the nostalgia factor with Windows XP is real.
Second, articles written by the staff are never paid for content. There are spon-con articles, labeled as such, but they are not written by me, Andrew, or any of the other regular writers. And yes, we generally dislike those as much as anyone. The most a company can do to "buy" an article is to contact us and offer us a review sample, and that still won't guarantee the review gets published, or that it has a favorable score.