Those guidelines are all about the heating effects of microwave radiation on flesh, the same way that an animal placed in a microwave oven would be injured or killed. And the FCC has established a limit for exposure of 1.6 W/kg where we can be sure that you aren't anywhere near having parts of you cooked.

Sufficiently intense microwave exposure can be a health hazard but there's nothing subtle about it, like there is with ionizing radiation which can make you sick days or weeks after exposure or give you cancer.

For 5G in particular the radio waves will tend to not penetrate as far into you body. Some militarizes have actually developed non-lethal crowd control weapons that cause a burning sensation in the victims' skins with the same sort of ~100GHz waves used by 5G but at a much, much higher power than the FCC would allow for consumer devices.