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Yeah a strong star fom City so far in the PL but they also haven't been properly challenged as well. City have game against Arsenal in October and that's the game where there is possible of a break in City's consistent form. Brighton in the next game after Arsenal will also be a tough fixture and possible drop of points for City. So some tough fixtures are getting lined up and busy schedule with CL games too. It would be interesting to see how City handles their games ahead.
Nottingham basically didn't threaten Manchester City that much in that match, but Manchester City still came under a lot of pressure because they were short of 1 player. As a result Ederson had to make several important saves in the second half, while Nottingham barely got to the Manchester City goal in the first half. Luckily Manchester City didn't concede in that match, but they almost scored the third goal if Haaland hadn't failed to take advantage of his good opportunity.
I'm sure Manchester City will play better against Arsenal, it will definitely be a tough game for both of them. But no matter how difficult it is, I think Manchester City will still be the favorite considering its consistent performance.