Chelsea's performance so far this season makes them title contenders as long as they continue to perform at this level, especially given Man City and Arsenal's inconsistent results this season compared to last season. Given Chelsea's long list of players, I believe they will maintain their current performance until the end of the season, as an injured player may not be a disadvantage except for a player like Cole Palmer which is Chelsea's current best player.
The only thing Enzo Maresca's comment made me realize is that we still have a long season ahead of us, so it is too soon to declare Chelsea a title contender, especially with Liverpool on the rise. This season, I would not be surprised to see a one-man race for the title.