There is a big difference between "he is right" and "You can't prove he is wrong". Is there any evidence he is right?
There is evidence that Google has acted in a partisan† way in other areas, though, which is what makes the assertion worthy of consideration.
†: "partisan" might not be the best word here. "Ideologically-driven" might be better. Google has acted in its capacity as a content host to suppress content that it finds inappropriate, even though that content was benign. Example: https://www.bloomberg.com/news/articles/2018-03-21/youtube-b...