Particularly because the Supreme Court, in an opinion written by Justice Scalia in 2000, held that FCA relators are *assignees* of the government's right to sue, which is flatly inconsistent with this holding. Mizelle is acting like a recent Justice Thomas dissent overruled that opinion of the Court

Supreme Court: X is the law Thomas dissent: Maybe not FedSoc judge: X is no longer the law (sigh)

You obviously do not need to be an officer of the United States to sue on the federal government's behalf if the federal government has assigned you its right to sue.