What Bayer Leverkusen, the Dutch manager, is trying to achieve is easier than Manchester United. Manchester United faced many tough opponents when aiming for the Premier League title. However, Bayer Leverkusen will now only face serious competition from Bayern Munich. Therefore, a less competitive Bundesliga is more likely to be successful than the Premier League. It could succeed there.
In part, this may be a possibility, but the Bundesliga can't be underestimated, because Dortmund is also strong. There are other teams that can pose a significant obstacle. It's true that they aren't teams with very high levels of quality compared to the Premier League teams.
But if the coach underestimates the other teams too much, then he'll run the risk of not finishing in at least third place. Because honestly, I highly doubt that Leverkusen's management is having high expectations for winning the title. I see it more as a goal to reach the European Champions League, and to go far in that.