It sounds like unhelpful marketing speak.
All our tags should be nouns. Any tags that are not nouns should be renamed as such.
Do you agree?
Some hierachical tags could replace it with hierachical-query, but then similar compound tags would have to be created for those that do not fit this new tag. If a question is just tagged hierarchical it probably needs another tag to provide context. While it may not be able to stand alone as a tag it still helps limit the scope of the question and is therefore useful.