The documentation for NewType at https://mypy.readthedocs.io/en/stable/more_types.html#newtypes states:

...the typing module provides a helper function NewType that creates simple unique types with almost zero runtime overhead.

However, as the cpython documentation for NewType` states:

Changed in version 3.10: NewType is now a class rather than a function. There is some additional runtime cost when calling NewType over a regular function. However, this cost will be reduced in 3.11.0.

In Python >=3.10, NewType is a class rather than a function, meaning the mypy documentation is now incorrect.

I'm not immediately sure how it could be rewritten in a more accurate way that is still concise, however.