Manchester City is not in good form now, it can be seen. Manchester City has lost four consecutive matches. This is not a normal occurrence. We have not seen Manchester City lose four consecutive matches in the last 5/7 years. From this, it can be assumed that Manchester City is not in good form. At the same time, Guardiola is under a lot of pressure.
Manchester City don't have good form recently and it is even true to say they have terrible form. Even before the serious injury of Rodri, there was prediction on downside of Pep Guardiola era is coming, because some main players in his squad have been becoming older and surely their performances will only become worse with time. Kyle Walker now is no longer strong and fast enough to beat attacking players in dual races. Some other positions began to show signals of decreasing performances too.
The injury and absence of Rodri actually affects Manchester City operation a lot, but it is not only one reasons for their terrible form.
You have mentioned an important point. Several players in the Manchester City squad are getting older. And Manchester City are not getting the great performance they used to. And maybe that is why we are not seeing good performance from Manchester City this season.
However, Manchester City started the season well this season too. Manchester City were in great form. But Manchester City's performance in the last four matches has been terrible. However, Guardiola has had enough time to find the weaknesses of the team. I hope that after the international break we will see stable performance from Manchester City again. However, winning the title this season may not be possible for Manchester City. Because Liverpool's overall performance is much more stable than Manchester City.