I think it matters none what Cat this flight was conducted under (Air Work according to the report so far) it's still an A/C carrying people but the one underlying problem here is that less than max fuel was carried to an remote Is at night where the Wx was or could have been sus (as it turned obviously was very sus) in a light twin,that's the part that needs to be hammered home,simply be smart about the operation from a safety stand point not from a commercial stand point.
They where damned lucky it was a West Wind Jet you couldn't pick a better airframe to ditch with, engines up out of the way,fair amount of fuse blw the wings making it like a canoe with large outriggers!
Doesn't matter what the report says or will say eventually does anybody ever learn from the mistakes of others in aviation?....rarely!
Wmk2