Pep doesn't set up the same way against everybody but he he does stick to his key principles. I don't think he so obviously changes things at City as for instance he did in his last season at Bayern when I recall looking at the average positions in his team over a run of games and he quite clearly used something like six different formations in seven games.
I think a lot of the changes he makes for each game plan are not easy to spot and I'm not a football analyst but I think I can spot in some games where particular movements or passes are being made that seem to be repeated that look as though they have been planned for that game. More obviously, his team selection varies not just through rotation but also in response to specific opponents.
I'm not really inclined towards picking out Pep's faults: plenty of others seem keen to do that. Whether it is a fault or not is debatable but I would be more cautious in some games. He may need to adapt how his team plays as we could be stuck in a bit of a rut butting up against an interminable procession of parked buses but only time will tell that: new player recruitment may just lead to his team executing his way more effectively and that will solve the problem. His approach may inhibit some players and deny them enough freedom to express themselves; it may also drain them. Again, time will tell.
Oh and he talks about the Scousers too much but the media don't exactly make it easy for him.