Also, I assume they are referring to humans not keeping the cellphone 9h per day close to their brain.

First off, many do in fact sleep with their phones close to their head these days, and second, what about the phone being close to the body/male testicles (in the pocket) throughout the day?

One other thing, wasn't the issue also not just with the phones themselves, but with the cell towers? I believe 5G towers need to be installed every 300 meters. If the towers are indeed dangerous due to how much power they radiate, then how many people will that affect in busy centers/apartment buildings?