Hi Paull!
This is more of a technical addition to PokaTheme, so there isn’t actually a new feature/option in the Dashboard.
There was an issue in the previous version which was pointed out by a user, and the issue was that, if you created a Review using a UserA account, and then UserB made some change to the Review content etc., then the Review author was set to UserB, leading to changes in the Schema and also in the change of the Author bio section (e.g. https://demos.pokatheme.com/pokatheme/review/5-gringos/).
By adding “theme support” for Author (this is something technical of WordPress), the above issue is resolved.