Where, in the article, did you see any mention of recycling pig waste? The article is about food contamination, not sustainability.
Pig manure is causing problems in this world. For example, some serious effort is made to find the best storage temperature to reduce methane emissions - see www.engr.usask.ca/societies/csae/protectedpapers/c0209.pdf for exemple.
So anything that will reduce or convert the amount produced is a good thing.
Again, all the context necessary is provided in the article. I'm not against finding a solution to the "pig waste problem." I don't think feeding it to food sources is a logically sound primary solution any more than feeding children radioactive waste is (for the "radioactive waste problem").
But the radioactive example is a fun one- wasn't there a plan to reduce the risk of radioactive materials by including them in construction materials, so that the emitted radiation would be lower? Some believed that it was safer than concentrating/burying them.