They're worrying about tritium, which has a half-life of 12.3 years. It's been 45 years according to the article which means it's down to 7% of the original radiation. There are no stated measurements, and they say "there's no safe minimum" which means they are talking about extremely small amounts. I bet 10 fake internet points this is less radiation than these "people" receive on their river water than comes from the smokestacks of their coal-fired electric plants every year.

So the article seems like pure FUD.

Then they compare it to the Fukushima water which, on initial release, had literally zero effect on anything because it was so low a level of radiation.