The story is presented as though this were some new revelation. Pretty much any wild fish or wild animal that you catch or kill is going to have some kind of parasites if you look closely enough, ranging from big, obvious worms to microscopic single-celled parasites. Various tapeworms and roundworms are common both in the fillets and internal organs of many marine and freshwater fish that you’ll regularly catch or buy. Just cook them thoroughly, avoid sashimi, don’t look too closely at what you’re eating, and you’ll be fine.