What's up with the new statutory write-off laws?

I'm in QLD and looking for a ford ranger for towing purposes so I've been keeping an eye on salvage auctions for both a repairable and a stat writeoff and finally two came up that looked suitable. The stat in QLD and the repairable in NSW, 2 days after.

The stat was won quite cheaply. It's a flood affected vehicle from the recent Cyclone Debbie storm but it didn't have any panel damage so it looked like a good donor car.
The repairable one was pulled from the auction on the morning of auction day as it was listed incorrectly, turns out it was actually also a stat.

So now I have the one stat and am keeping an eye out for another repairable one, but it seems crazy that this stat is a stat.
Water came up and lapped across the seats but it has now been stripped bare and cleaned. The electronics under the dash were not affected and all the wiring plugs that showed corrosion have been repaired. The only module that was affected was the tow assembly under the passenger seat. The engine so far seems fine, gearbox also fine.

Wovi have told me that any part can be re-used from a stat, that the chassis and shell (or sections of it) can be re-used if I have a repairable ranger that is crumpled.
It seems like madness that the same chassis and shell can't remain with the rest of the vehicle - which has no structural damage - but it can be cut up to repair a different car that has considerable structural damage.

It seems like such a waste. The laws appear to have changed since the last time I got a flood-affected car from the auction but it is what it is I guess.

Can anyone tell me if I've understood it correctly? That the chassis/shell/whatever component really, can be taken from a flood-affected-but-undamaged stat and put into a completely crumpled repairable, but components from a repairable can't be put into a flood-affected-but-undamaged-stat?

I'm told by wovi that if I have a repairable and the damaged section is the bit that the VIN is stamped on to... that I can take the same section from another car and then receive a surrogate VIN to be used in place of the two VINs from the original car and the donor. But that it only applies to cars which have structural damage to sections with identifiers so that doesn't apply to me.

If another repairable one doesn't come up, worst case scenario is that this car could be sent off to NZ (with disclosure of its history, of course) for sale so that's no biggy really, but it would be nice to hear if anyone has found their way through the legislation to use majority of the components from a stat.