The IARC made the classification which the WHO adopted but the WHO still claims there is insufficient evidence to justify lowering the quantitative exposure standards, bc they are a bunch of corrupt buttholes, so I’m not surprised you weren’t able to find much on the WHO site.
Here’s some sauce on the IARC classification of radio frequency radiation in 2011:
iarc.fr/en/media-centre/pr/2011/pdfs/pr208_E.pdf
Yes ionizing radiation such as that found in the higher light frequencies and beyond has enough energy to immediately strip electrons/destroy molecules. Non ionizing radiation from radio/microwave/ELF doesn’t have enough energy to immediately destroy molecules but it does has enough to vibrate molecules. Over time this constant vibration has a cumulative effect which weakens then destroys molecules such as single and double strand dna. This has been verified in studies that showed non ionizing radiation causes the presence of nucleotides (dna fragments) to be found in the blood.
Dr Blanks book is well referenced re: the various studies and what they showed. Highly recommend reading it.