I don't know about fermented but what evidence do you have that they 'dropped dead' from it? Cod -fish-krill oil is one of the single most important supplements you can take and has been so in Europe for centuries. Funny the guy you link to is a raw milk advocate.. something mainstream health officials object to on the same grounds.
There are plenty of other advocates - that : healthy diet=healthy immune=healthy teeth
From what I can tell, there's no rock solid proof of them dropping dead from it, but fish oil/cod liver oil simply cannot be fermented. Basically they are consuming rancid gutter trash.