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It does take time to build a team when you are bringing in new players into the club. Todd Boehly cant take ownership of Chelsea from Abramovich and expect things to be going in his favor in the first season after sacking Tuchel and bringing new coaches and players into the Chelsea team. No team has ever remained formidable when there are so many changes made in the team in terms of players and coach.

From the picture above, 90% of Chelsea players are gone out of Chelsea. Remaining 10%. The 10% would soon leave Chelsea.
It's unfortunate that Chelsea had a bad season last season, I am looking forward to it being corrected by the upcoming season by Pochettino and his new signings(players)
I agree with your assumption because it's too difficult to build a solid team in one season when management and players have changed. Chelsea have made a major overhaul of their squad which in the first season has not been able to produce the expected results, but they have the opportunity to perform well next season.
Pochettino, yes I am thinking about that guy. Pochettino has succeeded in making a lot of changes to Tottenham during his time as coach. He successfully won titles with PSG and next season his capacity and ability as a coach will be tested with Chelsea. For me Chelsea just need to be patient until finally they are able to compete tightly in the Premier League again, but expecting to return in 2 seasons after big changes is very difficult.