This is nonsense.
Iheanacho is a fantastic player in the build up hence why he used to be a 10/right winger. Pep ruined him by pressuring him too much and putting too much tactical stuff into him, Iheanacho is the kind of person that takes that to heart and works way to hard and tries to hard to prove himself to Pep which resulted in him being mediocre.
Iheanacho under Pep was a confused striker that didn't know what to do who was trying to hard for his own good. He wasn't given the chance to adept like Aguero was because he isn't Aguero. Iheanacho will be a fantastic player as a goal scorer and a creator and City will buy him back.