1/ You know who I trust to tell me about whether the Earth is over-populated and will remain that way or whether we're likely to experience a massive population decline and when? Demographics and population researchers!

2/ For example: "Though the fertility rate will decrease, total population itself is not expected to decline within this century because of a phenomenon known as 'demographic momentum' as large generations of young people enter their reproductive years." https://worldpopulationhistory.org/projecting-global-population/

3/ I would not rely on a business magnate, who is primarily involved in aerospace and autos, and who has no background in fertility or population research, to know as much or anything at all on this subject.