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Whether or not the original string is returned is an implementation detail: PEP 616 neither mandates nor forbids the optimization of returning the original string, so one should not rely on s.removeprefix('xyz') is s being True. In general, the identity of immutable objects (-10 is -10) is an implementation detail, and one should compare immutable objects by value (-10 == -10).

If you want to discuss further, please open an issue on bugs.python.org.

Note that the docs for str.strip also say that "a copy" is returned, but:

>>> s = ""
>>> s.strip() is s
True

As @sweeneyde says, this is an implementation detail though, so let's keep the current wording.