It can't be a benchmark indeed, but at least we can measure the strength of a team like Leverkusen at this time, whose embarrassing defeat in the pre-season match made many people doubt the Leverkusen team under Ten Hag's coaching and assume that they will not be better in the future, I think it is natural to use this as a benchmark or speculation about what will happen in the future.
I hope Leverkusen management does not regret choosing Ten Hag, given his early performances, even though it was just a pre season match.
Many criticized the decision, but others supported it and gave Ten Hag a chance. However, Ten Hag performance with Leverkusen could determine his future coaching career. He's likely under pressure to improve Leverkusen.
I said it before that Erik Ten Hag will soon show Leverkusen how he is coaching a team, just look at his first pre season game, very poor performance from all the players and the coach, Erik Ten Hag will soon spoil a solid squad that Xabi Alonso has built for Leverkusen, I know that Leverkusen sell some of their stars players and that will be some problem affecting the team but getting defeated by Flamengo under 20 boys is very shameful for a club like Leverkusen.
After the match some players want to leave the club because has it’s stance now Zhaka has decided to leave the team and other players are also thinking about that which means Erik Ten Hag will build another squad for Leverkusen next season, I don’t think Erik Ten Hag can coach a team like Leverkusen and with the way things are going Erik Ten Hag can get sacked after next season.