That may apply if all life must be 1) human-like 2) carbon based 3) if the ‘science authority’ had inside knowledge or was just making it up to gain grant money.
There is absolutely no evidence that the moon has anything to do with an Earth origin - wrong chemical/mineral composition to begin with. More ‘science authority’ speculation for grant money. Explain why the density of the moon’s crust is hardest nearest the surface and consists of rare elements not found on Earth. Explain why one side of the moon appears ‘melted’ while the other is completely pockmarked with craters exhibiting no ‘melting.’
Again on extinctions there is no evidence to back one theory over the other; and Occam’s Razor only works if one knows all the possibilities which no one knows. It just as likely that the solar system passed through a high energy dust cloud and life changed. There is no explanation for The Cambrian Explosion where whole phyla appeared almost literally overnight.
Again “we are told” that the Earth is warming and man is the cause ... believe that stuff if you choose. No one has ever found a ‘rouge’ planet - pure speculation.
Always be skeptical in science especially with pronouncements by some ‘science authority.’ There is no reason why some form of life, intelligent life, based on energy, for instance, could not arise in the ultra high energy center. You need to delve deeply into high energy physics and particle interactions to understand that there is no limit given 13 billion years to become whatever life chooses.
In closing: “The universe is not only queerer than we suppose, but queerer than we can suppose.†- J. B. S. Haldane
Is all life carbon-based, here on Earth ?