Arsenal is still in the title race it's still very early to see their loss against Liverpool as something that will hinder them from becoming champions unless you think they will keep losing points in their coming games, Liverpool looks better than most of the teams and their squad can't be compared to that or any team in the league right now not even the Arsenal team I think it will take injuries to see them not winning the league again not even after signing Isak again.
Liverpool signing of Isak is a very big boost for them and I think they are more prepared than any other team we can think of for the premier league trophy this season. I missed them signing this player and was caught up in other transfer without noticing this particular one sooner. I am very happy for Isak and also for Liverpool, they’ve both have an upgrade in their respective sides and this will make them more formidable for the premier league title this season.
City is struggling it has nothing to do with their goal keeper so bringing another keeper can't help the team but changes in their performance can.
Let’s see the effect of the new goalkeeper they’ve signed, maybe it’ll help them better in the competition not to concede more goals and be in a better position for the league title amongst their rivals.