I don’t have the repo, but I did grep looking for “home” definition across the whole site and found only these lines relevant:
./env/lib/python3.6/site-packages/setuptools/package_index.py: """Find rel="homepage" and rel="download" links in `page`, yielding URLs"""
./env/lib/python3.6/site-packages/setuptools/package_index.py: if 'homepage' in rels or 'download' in rels:
./env/lib/python3.6/site-packages/setuptools/config.py: 'home_page': 'url',
./env/lib/python3.6/site-packages/setuptools/depends.py: def __init__(self, name, requested_version, module, homepage='',