Now I have 100% FOR SURE that this spin off is the true Saekano history. The author wanted to make a Utaha route in the main series, with Utaha (AKA best girl) winning, however, due to the editor and publisher pression, he had to write a Megumi route as canon.
This chapter is a metaphor for what the author had through. Remember guys, Utaha's ending is the real one.