Won't this require citizen to provide ID and therefore citizens asking difficult questions could become a target for retaliation?

Yes, and there is currently talks if this also means NGOs like FragDenStaat or media outlets could no longer request information.

You can also be a resident, paying plenty of taxes, yet not be a citizen.

was already the case https://www.bverwg.de/pm/2024/10

It's already the case that if you question Israel's right to exist you are considered an antisemitic terrorist and arrested - they are now trying to codify this into an actual law (not just something the police do).

There is no freedom in Germany. The mistakes of the past did not change anyone's mindset about human rights and freedom. They only learned how to put on a facade of caring about them. And they are the most powerful member of the European Union.