Sort of, the Immersat ping, by analysis reveals the range from the satellite. That’s how the arc was determined, see the link.
Here is a link to the Aussie military radar:
https://www.airforce.gov.au/docs/JORN_Fact_Sheet.pdf
Laverton would have seen them as they operate 24/7. Overlaying the Laverton range again reveals a gap that FL370 could have slipped through.
My theory de jure is pilot anti-government political protest/government embarrassment, marriage relationship anger, and then suicide.
Who is providing info about theses pings?