One point that James Churchward did make was that despite everything you have heard, the people of Mu did not go to Australia and leave behind great ruins and such.
AUSTRALIA.—Australia appears to be particularly bare of ancient records, legends and traditions, which is not to be wondered at if my geological deductions about Australia are correct.
Lost Continent of Mu Motherland of Men, pages 79-80
On the other hand, a recent news report indicates that new evidence shows another settlement concurrent with Mungo Man has been dated to 40,000 years ago (from an original 28,000 year old estimate.)
This expands the area of control that the original inhabitants of Australia and helps remove the idea that Mungo Man was alone…
Have a great day.