Just read the absolute cr*p on that known aviation expert's web site. He is totally out of control and should be put down.
Even though this occurence happened in G airspace, one could imagine how many more could have happened by now in the famous E airspace outside of radar.
Call at 30 nm is the norm for most turbine aircraft operators, on the normal descent profile you are approaching A100. Usually things are a bit busy approaching TopD, with company calls, ATC clearances and IFR traffic etc. that the chances of hearing much on the MBZ would be low.
In this case itwouldn't helped much, because the it would have only taken 4 mins from 50 to 30 miles, and the near miss occurred shortly after 30 miles, so the Bras crew wouldnt have heard anything from the PN68, as i beleive the last report the PN68 made was over KNX.
Dare shall I say it, but this wouldn't happen in the days of FS, every one had traffic whether VFR or IFR.