I mean this is obvious nonsense.
He's won 11/13 finals.
He's won 16/27 semi-finals.
He's won 24/27 quarter finals.
He's got winning records against every manager he's ever faced 3+ times. He's got a winning record against every club he's faced more than once except Liverpool (W5-D5-L6).
He's got winning records against United, Chelsea, Arsenal, Spurs, Real Madrid, Dortmund, Bayern Munich.
He's reached more semi-finals than any other manager in European Cup history. Only 1 manager has reached more finals in CL history.
It's frustrating that we've lost today, and I think Pep's got his flaws, but he has the best record of any manager in the history of the game and that's not debatable.