I watched the stream. They weren't paying much attention to chat. Them and versus each cleared each thing around the same time. I did stop watching for a while on oryx so can't say for sure there but saw when they figured out most of the mechanics on all the fights. They figured it out through testing not being told by chat. They posted the raid on YouTube. Judge for yourself but I don't believe they used chat at all.

If you don't think he saw anything that was being said in 50k viewer chat you're a fool. People were going, looking at versus the stream and going back telling them what to do.