CPM combination.
All teams have access to tactics and science. Teams like Brentford, for example, are known to lead on the use of data; which has helped them gain promotion and stay up. But at the end of the day, football is about winning zonal and situational battles in every game. If your team is well coached and consistently has better players in these different zones of the field in every game, then you increase the chances of winning consistently.
This is what City is doing, and nobody else has done. The well run teams (Pool and Arsenal), just haven’t had the depth in talent to keep that consistently high dominance within games, and across seasons.