The tag is present in Lintian version 2.109.24. That is the most recent version we know about.
Two or more general screens that mask some tags for entire families of packages masked the same tag. Exemptions are supposed to be decisive, reliable and rare.
Screens work a little bit like overrides, except they were authored by fellow maintainers who wished to address general issues in larger families of packages.
Your package provoked a tag that was subsequently suppressed by two or more of those screens. They are not supposed to intersect.
The context shows the supressed tag name and the bugs that originally gave rise to the screens. They probably explain why the exemptions were granted.
There is nothing you can do about this tag other than contact the requestors of the screens (or the Lintian maintainers). The screens are misaligned and must be reconfigured.
This tag cannot be masked or overridden.