That's very outdated, DB has been terrible for a long time though. Switzerland is still the best though. Here are some stats for 2025:
https://chuuchuu.com/2025wrapped
Since you have to scroll down quite a bit to get the list of most reliable European trains (with percentage on time):
1. Switzerland 97.8%
2. The Netherlands 93.9%
3. Belgium 88.6%
4. Austria 82.2%
5. France 79.7%
6. Italy 62.0%
7. Germany 58.5%
(Not sure why these are the only countries in the list.)