I hope that we don't see such an ugly performance when the league starts because I don't see why an under 20 team would win Leverkusen and you said that Ten Hag is only on experiment. However, I don't judge a team performance with the preseason matches, because they wouldn't bring out the best in them when playing on the field. I believe that Ten Hag will put Leverkusen back to standard.
Let's dismiss this match as unimportant and ignore it. They have a match against Bochum tomorrow. We'll all see how it goes, because I'm sure Erik Ten Hag will field his ideal starting eleven to disprove the criticism leveled against him. Bayer Leverkusen might show us their true strength tomorrow. If they get another bad result tomorrow, I expect them to have a lot of trouble with the manager throughout the season.
I am 99% sure that they will either lose, or the yare going to play terrible. That should not be all that complicated to see that he is a bad manager and he can only do a good job if they have the best team in the league, without having the best, then he will not do good. Bayern Munich could have been great for him.
Because they are not going to end up helping them at all, if they end up getting great result so that should not be worried for that situation. However right now he is at Leverkusen and not at the best part we are seeing him be bad and he will keep being bad. I suspect some super horrible season from them, think about it if we see them like 10th by week 10, that should be a lot more issues for the long term.