I also have the same thought. I don't think it will be easy for Man City to play as a guest against Newcastle, moreover, they won't play with Rodri, while Kevin De Bruyne will most likely not play as a starter. So I think there must be something lacking in the creativity and possession that Man City has.
Newcastle will definitely put up fierce resistance. They are not as strong as Arsenal, but considering that they will be playing at home, there is a chance that they could cause a surprise.
I will not underestimate the Newcastle team. The performance of this team is somewhat erratic though. But Manchester City are in very good form right now. City players are performing brilliantly in every match. Out of 5 matches, City dominated and won 4 matches. Despite not winning the match against Arsenal, we saw the dominance of Manchester City players throughout the match. There is no doubt that the City players played very well. However, as Arsenal played completely defensively, City could not win the match till the end.
Also City always perform well in their home matches. They will try their best to win against Newcastle. Unless Manchester City are too unlucky then I think they will be able to get full points from this match.