I think the match between Real Madrid and Barcelona will be won by Real Madrid. Real Madrid is currently in the euphoria of winning, at least it will be very good for the morale of their players. Apart from that, this match is Real Madrid's home match, so it is clear that crowds will be a huge advantage for Real Madrid. Meanwhile, for Barcelona, the painful defeat to PSG clearly had quite an impact on their mentality, so playing away at Real Madrid's headquarters will clearly be quite a tough battle for them.
If Barcelona loses this match, then there is no longer any hope left for them this season.
Real Madrid and Barcelona have finished their Champions League matches this season with different results, so I think both will immediately focus attention on El Classico this week, so far if we look at El Classico of course it is full of controversy and also high intensity for winning match is because apart from 3 points, of course winning El Classico will raise the motivation and prestige of the team, but after Barcelona experienced financial problems, I no longer see El Classico will present a balanced match and even this season Madrid has beaten Barcelona 2 times, so I see that Madrid will probably score another winning hat trick in the El Classico match later.
What you say is true, Barcelona has no hope of beating Madrid with their current performance, and of course this match could be decisive for Madrid in winning the La Liga title this season, if Madrid wins then the difference in points from Barcelona will be even bigger so It is difficult for them to thwart Madrid's chance to win La Liga this season.