I don't think that really means much, all of the (major) streamers are just being paid to play the game on stream for X amount of time/days when the game launches. It's not organic. Twitch is just another marketing spend for these companies. Most of the big streamers maintain the same average viewer count no matter what they're playing.
Currently, after #1 Just Chatting category with 445K viewers, Black Myth: Wukong sits at #2 with 246K viewers.
There are also some popular streamers which have streamed playing the game or the Gamescom event.