This link has nothing to do with your original scenario of googling for "testicular cancer" and subsequently getting denied for insurance or a mortgage. It's about social media. Social media != anonymized search data.

There is a huge difference between publicly stating for the whole world to see that you have cancer by posting it to Facebook and searching google and browsing webmd and an insurer somehow surfacing that search and browsing intent and then acting on it. You backed up nothing.