The tag was renamed or removed. We could not find it in Lintian version 2.114.55. That is the most recent version we know about.
debian/control, this field for a binary package
duplicates the value inherited from the source package paragraph. This
doesn't hurt anything, but you may want to take advantage of the
inheritance and set the value in only one place. It prevents missing
duplicate places that need to be fixed if the value ever changes.