re: "It is known that millimeter waves (MMW) are absorbed by surface tissue such as skin and the cornea."

Yes, because, we are not made of aluminum skin like most (but not all) aircraft, or stainless steel like a Cyber Truck!

Note also when you walk out into bright noon-time sun (and feel the warmth) you are receiving solar irradiation at about 1,000 Watts per square meter density. Cellular and so-called 5G operate several orders (like 3 or more) of magnitude less power density.

Also note a crackling fire in the fire place is irradiating at an order less magnitude than the sun (depending how close you sit to the fireplace) but nonetheless irradiating with long wavelength EMF/EM waves in the IR (Infrared) spectral region.