It is true that Chelsea did have some difficulty scoring enough goals to win the game. As far as I am concerned, that problem will not be going to give panic anymore.
It is unlikely that he will be a game-changing player for Chelsea in the near future. But other than that he will be there to give Chelsea a more stable performance in the attacking lineup.
I think Aubameyang still has got his touch and pace right but I would agree on that he wouldn't make much of an impact signing but I also might be wrong. We saw how well he was at Barca if he can continue that same thing then I think he will be the most goalscorer for Chelsea this season but well let's see about that as it depends mostly on Tuchel and his plans.
Chelsea is lacking players on the front lines. Aubameyang I think will do well at Chelsea. even if you get a place but indeed the role of the coach and the plan will be very important.
although he doesn't need to adapt to the Premier League, with a new club and new team-mates, it will take time.
Chelsea got some new players this season. there is even one club that has big ambitions for its interest in several players in the transfer market. if Aubameyang has the backing of Chelsea's midfield, he could be a goalscoring machine for them.