That's odd. I recall several channel owners claiming million dollar revenues, eg. Jason Njorku from irokotv claimed 1m in annual revenue on this channel for Nigerian movies:
The article talks about monthly revenue. And even if the average was in the middle (ignoring the "power law" mentioned above) then you would have a lot of channels making over $83k which equals over 1m annually.
What do you mean? $23k is the average for the top 1,000. The top 10 (and maybe even 100) (which includes RWJ) are making millions, this article doesn't dispute that.