No doubt Chelsea was having the worst time in 2022/23, and now they are doing their best for having improved performance in this season even their start is not ideal because they are having just eight points from the seven games and two win which are below then average but now win against Fulham on road can bring changes into their performance and fortune this is surely important now they are going to visit Burnley which also having first win against Luton and now having good confidence for facing Chelsea but if they are able to win here then surely we can expect good changes in coming days and this could be good for the Victor Osimhen as well which is looking for play here in this team with Champions League or UEFA Europa Cup is also important for him.
Maybe you mean the 2023/2024 season, but overall Chelsea performance is as you describe. Pochettino still can't make Chelsea stable enough to consistently get points, in the end sharp criticism cannot be avoided by everyone involved in the team. Ups and downs in performance often occur, especially since Chelsea has experienced significant changes. Starting from the change of club owner, change of coach, and at best the player transfer movement last summer. In the end, Chelsea looks like it has completely evolved and is facing the bleakest transition period, i think the standings proves this.
The victory over Fulham gives some hope of improving their performance, the next match against Burnley will confirm whether they have indeed improved. What is certain is that Pochettino will not be free from heavy pressure if Chelsea has not yet risen to the top five in the standings. It is unlikely that Osimhen will end up at Stamford Bridge, because The Blues do not have the potential to win any trophies in the near future.