This article has no mention of bioaccumulation. Pacific Ocean is so large that it can dilute huge amount of radioactivity, but bioaccumulation changes the story. Without estimates how well these leaks bioaccumulate, the whole article is useless. Humans are at the top of the food chain in the sea and overfishing and exploiting sea life close to it's maximum capacity.

In Chernobyl, most of the radioactivity fell into the forests, mostly away from human food chain (there are still recommendations to not eat too much berries, mushrooms etc. in many areas). The Pacific is 100% in human food chain.