For example, is it his fault that Sergino Dest missed a wide-open goal in the 6-yard box in El Classico? What if he took that chance and Barcelona went up 1-0? Then in the next game against Rayo Vallecano, which would turn out to be his last, again, Barcelona dominated but couldn't score. Sergino Dest again missed a sitter in the 6-yard box, Memphis Depay saw his penalty saved. And between those two chances and many others, Barcelona lost 1-0 despite an expected score line of 2.86 to 0.79.
Take Pep Guardiola and Manchester City last season. In November 2020, they sat 10th in the league after starting the year with 12 points in 8 games, their worst start in over a decade. Yet, they were leading the PL in expected points, which showed they were doing all the right things, just repeatedly unlucky. Fast forward 30 games later to the end of the season, and they won the league comfortably by 12 points.
And while I am sure Barcelona had access to this information and why it's vital, especially early in the season, to look at how well the team is playing before looking at results, it seems like they fell victim to fan pressure. There was the Super League fiasco that saw fans revolt, then they lost the club's number one legend to a free transfer, and now they've had a slow start to the league. The pressure from one of the world's largest fanbases ultimately grew too large. And when those fans called for the manager's head, the club finally succumbed to the pressure even though analytics showed he was doing a fine job, and it was only a matter of time until things turned around.