Has he kept off a hot team with potentially 97 points in a 38 game season with a 14 match winning run? They have conceded only 3 in the last 14 games. You need luck too. It's so easy for these players to make a mistake or ease off mentally, lose focus. Had they not won it last season with a points total over 100, I would agree completely with you.
The season we went unbeaten, that game against Liverpool after the dispiriting loss to Chelsea in the CL showed what that team and manager were about.
City's loss to Tottenham at home in the CL which would have been similarly excruciating could have easily derailed them. Oil money or not, this is peak performance.