The tag is present in Lintian version 2.104.234. That is the most recent version we know about.
The package appears to be installing debug modules in /usr/lib/debug/usr/lib/pyshared/pythonX.Y/. However, gdb(1) will not look for it there, making it less useful. The file should be installed in /usr/lib/debug/usr/lib/pymodules/pythonX.Y/ instead.
Refer to Bug#576014 for details.