Regardless of whether this is junk science or sound science, remember that we are talking about (according to the article) 119 "suspicious" deaths in five years. Sure, not all deaths are reported, but not all suspicious deaths are likely smoking gun evidence. And this is about 22 per year among millions of dogs being fed these foods.
We fed our last dog grain-free and it did wonders for her quality of life and her skin allergies, and she lived be 14, dying of cancer. Her underside, previously bright red and inflamed, turned a healthy pink and she stopped obsessively scratching and grooming herself raw.
Our current dog may not have the same issues as Reemy did, but given what I have seen with my own eyes, 22 *possible* deaths a year (which might be offset by other benefits) among millions of dogs is not at all persuasive. That said, if a more comprehensive study shows clearer and greater dangers that more than offset the health concerns of feeding junk, I'm open to hear it.