The tag is present in Lintian version 2.104.328. That is the most recent version we know about.
The specified manual page contains a Python traceback.
This was probably caused by a call to
help2man failing to
correctly execute, likely due to an missing or incorrect
PYTHONPATH environment variable.
Note that calls to generate manpages from binaries may succeed if the package
being built is already installed in the build environment as might locate
potentially old copy of the program under
is fairly common on maintainers' machines, for example. However, in
environments where the package is not installed (such as most buildds),
generating the manpage may fail and inject a traceback into the manual page.