It's important to note that according to official dogma, non-ionising radiation can not cause cancer. I've heard my own concerns about non-ionising radiation dismissed (even belittled) so many times that I've lost count. Most often this comes from educated people who think that their education constitutes the whole of all knowledge about the universe and that there is nothing left to be discovered. But one should understand that if this dogma was correct, there should be no link found at all.
I did a physics degree at uni, and then spent many years working in genomics. And I've never (even before the biology work) assumed the "non-ionising radiation can not cause cancer" to be a true statement. You can only come to that conclusion if you assume that ionisation effects are the only pathways that can cause cancer.
After working with biologists for many years I've come to the understanding that biology is extremely complex, we have an extremely limited understanding of it, and there could be any number of as yet undiscovered effects of non-ionising radiation on cellular biology.
I would hope that as more of these studies are done (this is not the first and probably wont be the last) that we would hear less of this dogma spouted by supposedly smart people, but I doubt this will happen. It doesn't matter what you do, intelligence and education often go hand in hand with ego and a feeling of infallibility. And the dismissive "non-ionising radiation can not cause cancer" people never miss an opportunity to tell you that doubting this "proven fact" makes you stupid.