what I mean with the second sentence is that if you want to keep getting good results you have to have a critical view of the things you can improve and try to improve them.
Getting good results in one area shouldn't be an excuse to justify not being good in others.
I hope the interview doesn't sound like I'm only complaining about Germany, it's more in the hope that it improves so more companies can be created and maybe the example is followed by other european countries.
"you have to still try to do better if you want to keep it that way ;)" roughly means:
Nothing is ever perfect but we should actively seek continuous improvement, as well as try hard to identify weaknesses in order to correct them.
After 3 years here, I am slowly learning. Wie Rewe, jeden tag ein bisschen besser.
edit: this is why it is typically un-German to boost, and more typically German to complain -- they are just pointing out what to fix!
Not sure what you mean by your second sentence, I'm not German.