The sort of people who are happy to contradict authority were totally correct to contradict the WHO. The WHO weren't communicating best known evidence; they were communicating best known evidence that was acceptable to the Chinese.
YouTube removing people who disagree with the WHO is YouTube setting up a system that will amplify Chinese (or other large state sponsored) propaganda. And I can give an excellent example of a credentialed person who was correctly applying his credentials to warn people about an outcome that has, in fact, emerged. People like that will be targeted under YouTube's policy, which is not interested in correctness but in authority. It is enacting a policy that would have made this crisis even worse for me, because it would have removed the channel that I found out about it from. I am very thankful for having 45 days early notice.
Also, there are plenty of cases of respectable scientists throwing away their credentials to make a ton of money making completely unscientific social media posts. I'm not saying this guy is doing that, but YouTube certainly need to do more than just look as someone's history and whether they're published. The article you cite is from 27 years ago. He will certainly have changed a great deal in that much time.