It’s still the same amount of nuclear materials decaying over time. That would be like saying its a good thing the Pacific Ocean is there to disperse the radioactivity throughout the pacific current.
One day they might be able to use robotics to gather what is left of the rods. I’ve also heard talk of creating a frozen zone around the reactor to keep contaminated ground water from seeping into the Pacific. Read a couple days ago the readings are so high that it kills the robotics circuitry within a few hours. Perhaps they can harden it better like military hardware to work longer. It shouldn’t have happened. Japan has records of tsunamis hitting the country going back over 2000 years.