Montgomery Central will take East Montgomery's spot on the schedule as part of the Rocky River 2-A conference for its first two years. I'm not sure what the criteria will be playoff-wise...at one time, a school playing down could not go to playoffs back-to-back years (happened to Murphy back in the 1990's).
When the 2021 realignment is done, I would expect MC to be placed in a 3A conference with Asheboro, SW Randolph, etc.
As for not classifying them 3A immediately, it is probably because of the mayhem it would cause with schedules in whatever 3A conference they would be placed. Adding a team to a conference schedule in the middle of a realignment would be a scheduling nightmare for the schools in that league. Moving them into the existing EM spot in the Rocky River 2A conference is about the smoothest transition possible. That conference needs another team, too, since Central Academy of Monroe dropped varsity football after the 2017 season.
Oh, and I agree with mistermean on the unfair criticism of the Lexington Dispatch sportswriter. Ending an article with an applicable quote is a common journalistic practice.