The level difference undeniably made the situation a bit more complicated than expected but I'm pretty sure they didn't expect this kind of result to happen in the end

Even though they realize that the possibility of losing is very high but no fan would want their favorite club to lose with such an impressive score.
Talking about the performance on the pitch, they were already shattered with 4 goals in the first 21 minutes making them lose focus and their mentality got weaker which made 10 goals inevitable in today's match.
2 matches finished and 2 more to follow and we've seen 14 goals just from Bayern and PSG for this exaggerated club test called the Club World Cup

If Bayern Munich is very reasonable, I don't even know the other club and that is a very extraordinary difference. But indeed, 10 goals, that is really rhumilating without mercy.
Now what is very interesting is PSG vs Atletico Madrid. Atletico Madrid was even slaughtered, this reminds me of the UCL final yesterday between PSG vs Inter. Although this time there are several top players who are not included in the starting eleven, PSG's performance this season is indeed very extraordinary.