Bad headline. 5G covers a huge spectral range starting at, yes, 5 GHz. 5GHz is coming out of every home router built in the last couple years. If it was unsafe, we would probably know about it. (Let’s say ‘unsafe’ as in, “it is ‘unsafe’ to drive a car” since we need some baseline risk tolerance).
The article claims this is in fact the case. Quote:
"We are seeing increases in certain types of head and neck tumors in tumor registries, which may be at least partially attributable to the proliferation of cell phone radiation."
I've clicked a few cited papers and they are all behind a paywall, so I can't make my own opinion how justified this claim is.