You’re adding to the confusion.
kWh (as in kW*h) and not kW/h is for measurement of energy.
Watt is for measurement of power.

May I please ask whether an unlocked bootloader is still bad for privacy and the risk of data loss/theft, if the phone is enrypted?
My understanding is that while being able to mess with the phone (e.g. including installing a new OS) in the presence of an unlocked bootloader, a properly encrypted phone at least protects the data on it.
Did I get that wrong?

You can expect KI to expire like NaCl does.
The filler might be not ok after a long amount of time, but the KI will be and that’s what saves your thyroid.
Here’s some info regarding dosage:

from: https://www.fda.gov/regulatory-information/search-fda-guidance-documents/potassium-iodide-thyroid-blocking-agent-radiation-emergencies