Land based fish farms might be the future for seafood. Actually rooting for Nordic Halibut and Salmon Evolution.
It has already been known for a long time fish, and in particular tuna, carry a lot of worms and parasites, which is why freezing rules are in place in pretty much every country.
For example here are EU regulations regarding freezing Tuna
https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=PI_...
Why is the headline trying to make it sound like it's new or a big deal?
That's a terrible sensationalist website btw...
Poor fish!
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Any angler will know that, in some lakes, it seems like every fish is full of worms. I've always dealt with that by frying the crap out of them -- no medium-rare bass for me, sorry. Alternatively, I'm sure they're fine after a few weeks in the freezer.
Rivers seem to be better, with worm presence (or at least, obvious worm presence) being less common. Additionally, I've never seen worms in bottom-feeding fish like catfish and carp.