In the Nuitka page you can read that

Nuitka Standard
The standard edition bundles your code, dependencies and data into a single executable if you want. It also does acceleration, just running faster in the same environment, and can produce extension modules as well. It is freely distributed under the Apache license.

Nuitka Commercial
The commercial edition additionally protects your code, data and outputs, so that users of the executable cannot access these. This a private repository of plugins that you pay to get access to. Additionally, you can purchase priority support.

So to encrypt all traceback outputs you have to buy the Commercial version.

In this Nuitka Commercial you can see the features only Nuitka Commercial offers.