Yes indeed, it seems that Pochettino is overconfident, so although it may be good for building his own confidence. But for the reality later related to the results, of course it can succeed and can also fail. So yes, we also can not assume that Pochettino will fail, because even though we think Pochettino's statement might be too much or consider the competition easy. After all, at least if we have an assessment for Pochettino, how the results Pochettino had when Pochettino became the head coach of Tottenham and also PSG, maybe it will be a benchmark for the quality that Pochettino currently has.
For whatever reason Pochettino has stated that to the media and whether he wants to or not he has to fulfill this promise because if not the risk is quite big. Even though he has led PSG, it is necessary to remember that the composition of PSG and Chelsea is far different both from the financial management and the players they have. Any coach when he has 3-star players just has to sit back and watch Trio Mbappe, Messi and Neymar play their roles on the pitch. Meanwhile, Chelsea's current capacity is certainly not a benchmark that can be compared. Plus the Premier League competitors are so tight and their opponents are far above PSG at the moment. So we'll see if Pochettino lives up to it according to his statement or if it backfires for him.
It's going to be a long road for Pochettino. If there's one thing I'm sure of, it's that the next PL challenge is going to be really tough. All teams are arming their squad. Interesting times ahead and Good luck to Pochettino.
Chelsea development process from scratch cannot be underestimated, and Pochettino must be able to measure the players he has brought in, especially considering that several players have not had promising achievements in the Premier League. So he better not promise something far to reach.