Now Labour's Adrian Rurawhe is proposing to fix that hole, with a Member's Bill which would bring PUS's under the OIA. The mechanism is simple: insert a definition of "Minister of the Crown" which includes PUSes. If it passes, we'd be able to ask David Seymour exactly what it is that he does in exchange for that $25,000 a year. The question is whether the supposedly pro-transparency, pro-accountability ACT MP will vote for it.
Correction: So, Seymour does in fact have delegated authorities; I missed them because PUSes were at the end of the file. I apologise for the error.