python-numpy* is no longer buildable in testing due to the removal of the "cython" binary package. The maintainer has requested removal of python-numpy from unstable but the ftpmasters have not yet actioned it, presumably because there are still reverse-dependencies in unstable. A rc bug is present but will not cause autoremoval because python-numpy is on the "key packages" list.
All of the reverse dependencies of python-numpy have already been removed from testing. So IMO it makes sense to remove python-numpy from testing at this point, do other people agree? * Note: since buster the python-numpy source package only builds python 2 related binary packages, the python3 numpy binary packages are now built from the numpy source package.