Did you read the article? He very clearly, using plain English and everything, did not make that claim.

He very clearly, using plain English and everything, said that those with a large enough presence to sway people should not speak with expertise and AUTHORITY they don't have IF they're making wild or fringe claims.

Key words here: authority and fringe ideas.

He also very clearly, using plain English and everything, demarked the difference between those like Greta Thunberg and Al Gore and this like Jordan Peterson. Thunberg and Gore are habitually very clear that they are NOT experts and they advocate for mainstream science. Conversely, Peterson does not make it clear he has no expertise. In fact, he routinely speaks with authority as though he is an expert in everything and he peddles wild theories with little or no evidence.