Why on earth are they not composting it, but instead putting in a landfill and locking it up? What a dumb idea.
Canada actually has scientists. From reading through these comments, I know that’s a shock but we do, they test things and they follow the evidence before making recommendations. In fact, those test results from back in 2016 are even public.
Just because this is news to you doesn’t mean it’s a new thing. Other cheaper solutions were looked into and they weren’t safe enough. It’s remarkably simple if you make yourself aware of everything involved. Salt in a compost though? How does that work?
Another solution would be to test it in a lab and then bottle it up and sell it, like it was originally intended to be done. But that's a non-starter for the same reason the producer went out of business back then.
It could be composted and that would kill the smell, it's just getting the ratios right and you might need an additional nitrogen source, but Canada has a lot of wood chips for the carbon.
The process may need an additional nitrogen source depending on salt content of the fish sauce. Because the required N per volume of wood chips so it composts hotly may result in too much salt for the process if only fish sauce is used. In which case it could be diluted in an additional (low salt) nitrogen source.
I don't know how much salt fish sauce actually has, just it could be diluted and composted anyway if it's too much raw.
Fish sauce is very high in salt.