The tag is present in Lintian version 2.104.234. That is the most recent version we know about.
This package contains both bitmapped fonts for a specific DPI
(100dpi or 75dpi) and misc bitmapped fonts. These should not be combined
in the same package. Instead, the misc bitmapped fonts should be
provided in a separate package with
-misc appended to its name.
Refer to Debian Policy Manual section 11.8.5 for details.