It doesn’t say either. It literally says “it’s unclear”.
For comparison, nature has limited the range of visible light: it doesn’t go through walls, is very well absorbed by human bodies, and is much more energetic than microwaves, yet we muck about it to our hearts’ content.
The energy of a 5G (60GHz) photon is about 10000 times smaller than that of a red light photon (430THz), if anyone’s curious.