I have responded to this with more detail on an Australian site.
RAAF didn't give Indo P-51s (some were operated by NEI AF, and after WWII went to NEI, which became Indonesia).
If a RAAF knuck had shot down a bad guy, do you really think it would have been kept quiet for nearly 50 years? I don't think so.
There was no engagement. Yep, journos do write crap.