I am difficult to judge whether they have been able to adjust or not but certainly what I can see for the Chelsea squad now, those who are mostly young players do not have a strong push from some players who have experience in the EPL before because most of the "Senior" players have gone on sale by Chelsea before.
On the other hand saying they still can't adjust is also indisputable because in the end we also know how their perfrma is and some players like Mudryk or Enzo are still stuck with their previous league.
For the Pochettino problem I agree he is a coach who has experience in the EPL especially when he coached Tottenham but on the other hand in this case the decision to sell some great players who have considerable experience at Chelsea I think this is questionable because in the end if Pochettino's decision is known like that then the results that are now happening can actually be predicted from a long time ago.
Aston Villa made good use of the moment when they were superior in number of players, the red card received by Gusto made it increasingly difficult for Chelsea to develop the game even though they dominated possession of the ball. Now Pochettino is under great pressure after again failing to bring the Blues to positive results, his experiments with young players in the main squad have not had any impact. 5 points in six matches is not the desired result, they have only been able to win one match against Luton.
Considering that their new owner has poured a lot of money into building an elite squad this season, but the fact is that their position is now stuck at 14th in the standings. The adaptation process for new recruits is said to be very slow, coupled with a series of player injuries making Chelsea performance decline even worse. Pochettino is increasingly in doubtful at Stanford Bridge, if he can't decide on a bad trend he could be fired. Todd Boehly will not let his club continue to experience bad things, Pochettino should understand that his coaching chair is now getting hotter.