Wrestling fans shouldn't care about ratings. Don't think wrestlers should either. Don't hear any talk about ratings with any other type of show. I think it's actually kind of embarrassing.
Also, it's all down to a flimsy algorithm. A small percentage of US homes are "Nielsen households" and their viewing habits are used to figure out the viewing habits of the whole country.
And Raw's viewership was actually higher. AEW just did more in the specific 18-49 age range which advertisers supposedly value the most. Not being reportedly like that though...
Jericho comes across as the biggest idiot when it comes to this sort of thing. Cares too much about it.