WWII in Germany...

[Gharren]

Could someone explain to me what the laws surrounding the mentioning of WWII are in Germany?

You can mention or explain about it whatever you want.
It is just not allowed to show nazi symbols such as the swastika in public (aside from educational reasons, like in museums), violations against this can lead to censorship or fines (e.g. if you put up a nazi flag in front of your house).

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It's a somewhat totalitarian state of Germany when Adolf Hitler was Chancellor of Germany. That means that the government has authority on all things, including your personal life and seeks to find it.

Hiding Jews or helping Jews escape from Germany is NOT allowed. You'll probably be tortured and whipped.

This happens in present day?

No, he's obviously trolling.