The tag is present in Lintian version 2.104.328. That is the most recent version we know about.
This package contains both 100dpi and 75dpi bitmapped fonts. Both
versions should not be included in a single package. If both resolutions
are available, they should be provided in separate binary packages with
-100dpi appended to the package name for the
Please refer to Debian Policy Manual section 11.8.5 for details.