In your analysis you completely missed the context that is fundamental.
Guardiola getting premier leagues in this 2017-2023 era with the best squad in the league by far is not the same as getting premier leagues in the 2000s with United, Arsenal and Chelsea all having consistently very strong squads.
Put Guardiola in SAF, Wenger or Mourinho place in that era and put one of them in current Pep's City.
City finished 4th with 66 points the season before he took over and to you that was the best team in the league by far? He created this team, while Chelsea and United hired managers like Mou, Tuchel, Conte to combat him and gave them 100's of millions to spend also, which they ultimately fell short .
There has been 3 English CL winners in the 2016-2023 era, they're also has been 2 all English finals and grand total of 7 finalist out of 14 (50% and 4 different English teams) in the CL in 7 years were English teams. PL in the past 7 years City x5, Liverpool and Chelsea x1 each. Compared to the 7 years from 2000, 1 English CL winner Liverpool, 3 English CL finalist Liverpool x2 and Arsenal. In the PL United x3, Chelsea x2, Arsenal x2 were league winners.
Now mind you i used a 7 year period for both as you bought up 2016-2023 era, so if you wanted you can change the time frame like there was an all English final in 2008, plus another English final in 2009, but these may knock some of Aresnal league titles away if were judging from a 7 year period.
Now other stats to look at strength of the teams, in 2000-2007 era the biggest gap between 1st and 2nd was 5 pts, in 2016-2023 era the biggest gap was 1 point x2 and 5 pts. Chelsea have hit 95 points, Liverpool 93 and 97 points, City 100, 98, and 94 pts in 2016-2023 era. In 2000-2007 only Chelsea broke the barrier of 90 points x2. However in 2000-2007 biggest title win was 13-14 pts (Chelsea), while 2016-2023 biggest title win was 19 pts and 18 pts (City and Liverpool).
In 2000-2007 manager in the PL were Sir Alex, Wenger, Mourinho, and Rafa to a lesser extent Ranieri, Pardew, Grant and Moyes or guys like Hodgson, Allardyce and Pulis. Only CL winners were Sir Alex, Mou and Rafa. Compared to 2016-2023, Pep, Klopp, Mou x2, Tuchel, Conte x2 to a lesser extent Wenger, Poch x2, Emery x2, Ancelotti, Sarri, Rafa, De Zerbi, Howe, Frank, Arteta, and CL winners Pep, Mou, Klopp, Tuchel, Ancelotti and Rafa. I think it's quite clear the the 2016-2023 era has had a higher profile of managers in the PL.
EPL teams from 2016-2023 are stronger overall then the 2000's.
I'm not denying managers wouldn't have some success with City, but I'm disputing them having the same level of success Pep has had there. It's like me saying if you put Haaland or Mbappe in the Barcelona from 2006-2015 or Real Madrid from 2014-2023, they'd be able to do the same Messi and Ronaldo have done, which is not true, they'd win titles even win.a CL, but they wouldn't have the same dominance, aura and consistency the other 2 have had. The same here in this situation, other managers can win, but they won't at the level and consistency Pep has.