@dictatordave @sickburnbro @matty That's partly it, Maryland passed a law last year and this litigation is claiming 2A and 14A (also some 1A with permission to carry in certain dwellings) violation by that law, so the impetus is a recent change.

*Edit, posted a Justia link to the case but it is not mentioned there, it's an amicus brief by the Brady Center. Link from the original video's description.
storage.courtlistener.com/recap/gov.uscourts.ca4.176096/gov.uscourts.ca4.176096.41.0.pdf