The claim that it was impossible because of human nature is what I’m challenging.
You asked for an example: Jane Austen was anonymous until her death.
The anonymity of Jane Austen was not remotely similar to Satoshi. Plenty of people knew her identity. According to Wikipedia she was contacted directly by the king's librarian. Also that was in the 1700s! In Satoshi's case, it's possible that no person on Earth has ever known his true identity other than himself.
But that's all beside the point. You misunderstand my claim. I'm not claiming that it's unlikely for Satoshi to want to remain anonymous. What's unlikely is for a successful person to not talk to anyone, not a single other person in the world (as far as we know), about their success. Even people who value their privacy and anonymity very highly typically still want to communicate with other people somehow. Satoshi clearly had good communication skills, and knew how to communicate while remaining anonymous, so if you want to argue that he was some kind of loner recluse who rejected communication with other humans you'll have a tough time convincing me of that.
Besides, Banksy does plenty of communication despite his supposed anonymity. It's not the anonymity; the total lack of communication from Satoshi is what makes me suspect he is dead. Even famously reclusive artists such as Bill Watterson don't cut off all communication with everyone.