For what it's worth: using a tool like pypi-parker technically violates PEP 541[1], since it uploads projects with no functionality solely to reserve parts of the namespace. You may or may not get away with using it, depending on how you use it, but PyPI's admins (who I do not speak for) would be within their enumerated rights to ban any account that uses it to squat names.
Thanks for flagging this, I was unaware! I agree with your assessment; I just hope that this is considered to not be in breach of the spirit of the PEP. It seems like the PEP intended to disallow squatting in terms of pre-emptively reserving and hogging names, the way domain squatters do it. So hopefully typosquatting prevention for the sake of security is considered fine by the admins; especially since our project was designated a 'critical project' and stricter security measures apply to our maintainers.
[1]: https://peps.python.org/pep-0541/#invalid-projects