The tag is present in Lintian version 2.104.234. That is the most recent version we know about.
Third-party Python packages should install their files in
/usr/lib/pythonVERSION/site-packages for Python versions
before 2.6 and
for Python 2.6 and later. All other directories in
/usr/lib/pythonVERSION are for use by the core python
Refer to Debian Python Policy section 2.5 for details.