Earlier quoted context omitted.
An advertising company deciding what is credible or not is scary.
But YouTube is not deciding on the credibility of the video. They are simply saying that in this emergency, in the interests of public safety, they will not allow videos that contradict World Health Organization information and policy guidelines. And they removed a video that violated that policy. It's a very narrowly defined exception to their normally open platform. I don't see what is scary or sinister about that.
No, YouTube still is determining credibility. YouTube is still saying, "this video is misinformation and we are removing it." The fact that it's treating the WHO information as the baseline does not change the fact that YouTube is deciding credibility, and removing videos that do not meet it's criteria for credibility.