While more study on specifics would be nice, you can pretty much go back to physics, for which they use an oversimplified conception of ionizing radiation vs safe radiation. It's not like that. As you go down in frequency, and thus energy density, the dosage needed to cause certain biological problems increases, even if a single energized particle isn'tenough to cause serious molecular damage. It's not safe just because it won't rend DNA with the minimum possible exposure.

They also did not do requisite safety research for 5G, just like a certain jab. Any of these modern wireless data technologies has human costs and risks, that need to be weighed against their benefits; and the transceivers need to be placed away from humans to an extent based on said never-done research.

That said, the way they're packing data, for 5G, is effectively creating bursts of those nasty high frequencies we're taught to avoid exposure to, except possibly on the low 500-700MHz bands. And 5G UC...just because that DEW can make the next Pokemon Go look like it was rendered on a RTX 4090 doesn't mean it won't slowly cook you.