Respectfully, I submit that you didn’t read the sentence fully. You seem to have missed the word “likely.”
“its LIKELY that people across not just the Fukushima region, but all of Japan and to some extent other countries down wind from the fall out, will experience significant health impacts.”
“Likely...that people will” is not the same as “Will,” as you’ve interpreted. FReep on.
touche!, BUT it isn’t LIKELY either!