Le Ping,
Do you actually know anything about the programming of TCAS/ACAS in various modes. I do.
If you did, you would understand there is nothing inconsistent with an adequate separation determined by visual on the other aircraft and an RA.
During the same period there was what was, in my opinion, a far worse event north of Brisbane.
In my opinion, and many others, an airline aircraft changed heading to deliberately create a loss of separation event to discredit the trial, such was the vehement opposition to change by domestic airline pilots.
All these years later, sadly, nothing has changed.
Tootle pip!!