Well, you know if someone is claiming Graham Hancock is contributing to science, you are listening to a liar or a fool. A few minutes of his tiresome twaddle convinced me it's the latter.

No idea where you connect this to "cancel culture". A person is free to believe whatever they wish but to claim that your theories have merit requires significant evidence to be taken seriously. Hancock seems to want people to disregard "so called experts" and be open to pseudo-science and unsubstantiated speculations and claims.

[scientificamerican.com]

If Hancock were being "canceled" his book would have been banned and he would not have been allowed to publicly relate his ideas. But his book was indeed published, reprinted, and a follow-up book was published... all of which were sold around the world. In addition Hancock had his own series on Netflix. So, no, he was not "canceled".