Earlier quoted context omitted.
This guy has made wild claims forever, never backed up with actual reproducible science. I'm not going to pretend that farmed fish isn't without its problems, especially for the environment, but dangerous to eat, no.
There was a report in the EU in 2017 or 2018 which suggested reducing intake of farmed salmon as a result of the study. It isn't 1 guys claim. Not only that there's a noticble taste difference between NZ King Salmon and Norwegian Farmed Salmon.
I don't doubt that there are differences in taste. There are tons of different types of salmon. That said, I somehow question why you think farmed fish would be that much different in NZ or Norway. Both countries have a huge fishing industry.
I can only comment on the sources that you actually provide. The last time this guy was in the news was because he attacked mobile senders with an axe because of some idea about electromagnetic radiation was causing all kinds of health issues.