"In the human skin, melanogenesis is initiated by exposure to UV radiation, causing the skin to darken. Melanin is an effective absorbent of light; the pigment is able to dissipate over 99.9% of absorbed UV radiation." https://en.wikipedia.org/wiki/Melanin

"Radiative relaxation quantum yields for synthetic eumelanin" https://pubmed.ncbi.nlm.nih.gov/15068035/

The key here is its "near ionizing" the mechanism is still based on photon energy for which RF does not have enough.

Near ionizing and up have non thermal effects, RF's much lower photon energy's only known action is thermal which requires orders of magnitude more power to create enough heat to damage DNA.

Wow, true. Interesting mechanisms of action:

https://www.sciencedirect.com/science/article/abs/pii/S09698...