Thanks for your input Katie. I certainly am not trying to shoot the messenger.
But to be honest I rather have the ambiguous definition rather than a poorly (at least in my mind) thought out answer Q&A occasionally gives on these kind of questions.
I am solving it on my team's robot by using the recommended regulator. On the robots I inspect, I will follow my LRI's lead. One of the advantages of being a flunky inspector is I kick the hard questions to up to management.
As an aside. It is poor practice to specify parts like this that are going to be used at the top of their range. I always take the pressure from inexpensive regulators and small diameter, uncalibrated pressure gauges with a grain of salt anyway.