Hopefully the worker is okay. I have to agree that the non-emergency classification seems odd. This should warrant a proper investigation and steps to avoid this in the future.
And the reason the contamination transport off-site was classified as non-emergency was because even though the amount of radiation detected on the guy is less than he'd have gotten from flying in an airplane; nuclear safety standards are so unbelievably rigorous and strict that even that small of an incident needs to be reported; even if it presents absolutely no danger to anyone anywhere (not even the guy that was contaminated) and hence is classified as a non-emergency notification.
⇒ the “non-emergency” classification isn’t about the “fell into a nuclear reactor pool”, but about sending the victim off site.
They returned to work the next day with minor injuries due to the fall. It doesn't sound like it was an emergency to me.