A company called Atlantic Sapphire does aquaculture of Atlantic Salmon in Florida. They are apparently using their own system. Their website doesn’t show any details.
As far as what it says in the link you provided, this bit:
“Salmon also face many other threats that affect their survival, such as poor water quality, degraded freshwater habitats from land use practices, disease, predation from introduced and invasive species, and interbreeding with escaped fish raised on farms for commercial aquaculture.”
I’m a Regenerative Agriculture “broken record”: current agricultural practices have consequences far from the land. That NPK and glyphosate dumped on a field in Central US will end up killing fish out at sea too.