You must not have been much of an Austrian if you didn't even grasp the basic point that individualism has nothing to do with isolationism. Also, it's a simple correlation-causation fallacy to claim that rainforest tribes are not advancing because they are anarchistic.
I wrote nothing about isolationism. I wrote:
An 'individualist' life is possible within a collectivist, materialist society only. Beyond the collectivist society, within the stateless
community, there is no individualism.
Self-sufficient rainforest tribes are not advancing and producing surpluses within 1 million years, because they are
not forced to produce surpluses (for the church and state mafia). To be forced is the only evident causal reason to produce surpluses. No state = no economy, no business.