It's the released water not the seawater. That causes vomiting, delirium, and hallucinations :-)

“A Japanese official said it’s okay if you drink this water,” Chinese Foreign Ministry spokesman Zhao Lijian said at a news briefing. “Then please drink it.”

The poster you asked is not that Japanese official. They just said dumping it was not a concern. Posting someone else's claim and asking them if they're ready to "back their claim" is disingenuous.

I realize that, and I would imagine everybody else in this thread.

That was why, to try to avoid sounding disingenuous, I tried to apologize upfront for the question, and recognized and appreciated the poster qualifications.

I was trying to qualify what safe means in this context. A bit like when talking for example to an aircraft manufacturer CEO, for example as in:

1) "This new airplane model is perfectly safe to fly" ...type of safe

OR

2) "This new airplane model is perfectly safe to fly, I will do a weekly trip on it with my family" ...type of safe

This argument is not useful. #1 and #2 differ based on the disposition of the CEO. A stupid, or not good at thinking about statistics and risks, CEO will happily get on a plane to get a bigger bonus, even if it's not that safe.

Your method of asking was very confrontational, even if you did start it politely. You challenged them to "back your claim" which wasn't their claim.

You could have asked something like "do you agree with the Japanese claim that the water is safe to drink? Would you be willing to drink it?"

Reading it again, I can see how it could seem that way, although none of that was on my mind.