The reasons he gave are the real reasons.
I'm never going to criticise anyone for not going, but the reasons you gave - work times, children having school and cost just don't hold up to any scrutiny. Other clubs' fans have jobs. Other clubs have child supporters who go to school. The club was giving tickets away for £7.50 to students for Leipzig.
The fan base just doesn't like the CL as much as the league, and that's fine. You see dozens of people on here who say they don't want to go because they don't like the competition and won't go for a multitude of valid reasons.
So as a football manager, all he can do is try and make the fans enjoy the competition by playing well and winning, and having some amazing games.
Which is exactly what he said.