I agree, according to statistics (either the first 15 games or 20, I don't remember exactly) Flick's percentage of points scored is worse than Xavi's. Bright games mean nothing if the team plays poorly on average. At the moment (and it's far from the final stage of the season) Barcelona is out of the title race. Moreover, it cannot be said that Real has turned into a monster with the arrival of Mbappe - on the contrary, the team has many problems and is in the "setup" stage.
Real Madrid are getting their feet back after so many injuries woes and Kylian Mbappe finding it hard to settle down before but things are becoming much more better, Mbappe is really doing well now and their attack is not entirely dependent on Vinicius Junior to get a win.
While Barcelona has been trashing Real Madrid this season meeting which still do matter but the overall winner is still going to be the league winner and Real Madrid is leading that race, and might in the end become league Champions again this season while Barcelona might just have to fight for second place against Atletico Madrid. The stat of Xavi in comparison to the number of games with Hansi Flick was even better but we are going to wait for the season or next to fully judge.