tl;dr - TBF, “shrank” means 1% per week. …but gained at the end. And the exact definition of audience isn’t specified. Number of screens? Accounts? Minutes consumed?
On the bright side, at the end of the article, it is suggested that Amazon was just one big circle jerk pleasing themselves for Season 1. …and next season will “[listen] to people’s responses.”
And they “aren’t over correcting for any of [Season 1].” So, although we should expect more of the same representation corrections for modern sensibilities in Amazon’s fanfiction, maybe our Sociopathic Mary Sue will be a bit less of a sociopath?