I can't say anything about Chelsea unless we start the next season and wait for some weeks because this changed many players and they are now using a coach which means they can change and get better form in the weeks after they have more friendly games and play some matches in the next season however Pochettino's performance in these friendly match are amazing we can even expect to see Chelsea getting back in the top of the league and race with other teams for the title.
Yeah we don't know what strategy Mauricio Pochettino used did he just use the trial strategy in the last few games or did he use the main strategy what is clear is that we cannot make the benchmark the last few matches, basically Chelsea does have great players so Pochettino just needs to apply the right strategy. As you said we have to wait for the new season to start to determine how far Chelsea have improved after Pochettino's arrival, besides that we also can't focus only on Chelsea because other clubs do the same thing.