Well, I think that he over stretches his argument a bit, but it is true for much of what passes as "the left" in the US and Canada.
Dissent is suppressed within the framework of corporate media monopolies. Predominant narratives are supported by corrupt “NGOs” – totally bereft of objectivity — and intelligence agency “fronts”. Real investigative journalism offering historical context and legitimate evidence are relegated to the fringes, far outside the domain of the broad-based “consensus of misunderstanding.”