First I remember seeing a promotional video by McDonald's about the manufacturing of the McRib when it was originally introduced. In that video there was a sausage maker who was absolutely thrilled to be making a sausage with such high quality slurry rather than what is usually used in pork sausage. I don't know if the McRib is still made as a pork sausage but that is essentially how it started.
Second I had a friend who worked at the Chicago Board of Trade who correctly predicted the first return of the McRib when he observed that the floor trader for McDonald's was buying up cheap pork contracts. This seems to support the premise of the article.