The tag is present in Lintian version 2.104.328. That is the most recent version we know about.
In the Unix tradition, Debian packages should have human-readable and
human-editable configuration files. This package uses debconf commands
outside its maintainer scripts, which often indicates that it is taking
configuration information directly from the debconf database. Typically,
packages should use debconf-supplied information to generate
configuration files, and -- to avoid losing configuration information on
upgrades -- should parse these configuration files in the
script if it is necessary to ask the user for changes.
Some standalone programs may legitimately use debconf to prompt the user for questions. If you maintain a package containing such a program, please install an override. Other exceptions to this check include configuration scripts called from the package's post-installation script.