I know this is a bit late, but...
Both your points are wrong:
1) He states that the notion of pristine wilderness is gone, because most wilderness that is pristine is now 'managed' by governments
2) He does NOT say that humans lived before dinosaurs:
"Even when you see the early pictures of the West, it looks echoingly empty, yet from our perspective today we realize there were indigenous peoples living there - and for millions of years before, this was the playground and habitat of dinosaurs."
You could accuse him of confusing grammar, though.