did someone else from the distribution do the work?

Someone else.

To be clear: I find the Debian maintainers trustworthy. But I don't think they're equipped to adequately review the existing volume of a packages to the degree that I would believe an assertion of security/non-maliciousness, much less the volume that would come with re-packaging all of PyPI.

(I think the xz incident demonstrated this tidily: the backdoor wasn't caught by distro code review, but by a performance regression.)