I do believe that was the point...
Frequencies below 1 GHz tend to be reflected and not absorbed (so the article says) and frequencies about 10 GHz tend to be absorbed by the skin and therefore do not penetrate very deeply. Its the frequencies in between that penetrate deeply, like into your brain, so the claim is.
More B.S.P.H.A.D. Vote 0’b and he’ll give you 10 gal. of gas,,,,whoopee