Very, Very Few People Are Falling Down the YouTube Rabbit Hole | The site’s crackdown on radicalization seems to have worked. But the world will never know what was happening before that::The site’s crackdown on radicalization seems to have worked. But the world will never know what was happening before that.
From the quoted bit it sounds like there was credible science that found nothing. That doesn’t mean there is nothing, but just that they found nothing.