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We can't rule out Rodri effect from Arsenal and Manchester City, but he is still suffering from the red card he had in their round 6 match they played with Nottingham Forest and sadly, he will not be available in their next match in the round 9 against Brighton, but maybe Manchester will be able to turn around things and still maintain their normal winning streak. If Rodri were to be around, Martineli will not get that assistance from Havertz because he will be there.
De Bruyne absence can't be rule out as well, if the guy was available, Manchester City will not go home without a goal, Arsenal will concede in any form. Haaland was on the match but I didn't see him, he couldn't just process chances despite Alvarez and Foden efforts in that match.
Manchester City's squad was indeed incomplete when they lost to Arsenal, but should that be the main reason why Manchester City lost and failed to score? I don't agree if the absence of Rodri and De Bruyne is the only cause of Manchester City's defeat, in fact they still have many other quality players such as Bernardo Silva, Phil Foden, Mateo Kovačić, and many others in the main line-up.
Manchester City's main problem in that match was that they failed to create many chances compared to Arsenal. The match statistics are almost the same, but Arsenal has more chances to score than Manchester City.