> Use Pipenv to manage library dependencies when developing Python applications. See Managing Application Dependencies for more details on using pipenv.
> Consider other tools such as pip when pipenv does not meet your use case.
That recommendation is absolutely unambiguous.
[0] https://packaging.python.org/guides/tool-recommendations/
> It's an official project of PyPA still, it's just not being pushed as the "be-all-end-all" option.
Those tools are relegated to a small section at the end, whereas the main body of the text says "Pipenv is recommended for collaborative projects..."
I'd say that counts as a specific endorsement of Pipenv. I guess it's an endorsement by the "Python Packaging Authority" rather than "Python Core" but it's pretty hard for someone at the tutorial-reading level to perceive the difference.