Citation for his first line: just google the WoW sub graph, they had 10.x million subs at the start of WoD and by the 2nd earnings call they were down to like 5 million and they stopped reporting because jesus christ what a dramatic drop.
There was a guy who used AI to estimate WoW's current subscriber count based on Google data, he did this going all the way back to vanilla and his estimates were very close to Blizzards actual earning call subscriber numbers before they stopped reporting them, found the image, I mean you know the game is either in free fall or holding steady at a number that would probably shock most people.