To be fair, Youtube shouldn't be the platform where doctors express their scientific opinion or try to win over support.
Having done it, I don’t necessarily love the process and would love for the process to be more open and accessible, but it generally works ok.
i am in no way against scientific material on yt but very much against a world in which a professionally edited and promoted youtube video is the minimal standard for scientific progress.
The jury is a little out on the utility of allowing unpedigreed randos to pontificate on the nature of the science with the same amount of volume and podium-authority as qualified, practicing scientists with years of experience. Academia certainly doesn't consider them the same; we don't allow any random undergraduate to walk up to the podium and kick the lecturing professor off the stage so that they can have 5 minutes to explain how etheric currents are actually what makes lightning work.
We aren't, practically speaking, seeing a lot of evidence that the public can tell the difference right now. This is a problem.
How are they going to deal with situations where health authorities in different countries have different positions? Like right now, Germany recommends masks and Sweden doesn't. Are they going to censor anti-mask videos in Germany and pro-mask videos in Sweden?
YouTube is almost certainly going to be banning literal doctors with actual PHDs from expressing scientific opinions which later turn out to be substantiated.
The article says this ban includes material that "explicitly disputes health authorities’ guidance on self-isolation or social distancing.". There are some rather eminent doctors who do exactly that. Social distancing policy is a political, not a scientific, question of trade-offs.