secondly, why would your "friend" have a BTC wallet on his smartphone if he doesn't know how to use it?
This point shows this story is unreal, it's Bitcoin mentoring fiction.
It seems he succeeded in that. Although the AI detectors do not give a positive result, it seems that the post is the result of a combination of AI and, as you say, a little adjustment to make it seem more human.
I read that there are softwares, tools to humanize AI-generated content.
https://www.humanizeai.io/https://www.humanizeai.pro/https://stealthwriter.ai/From AI, we have AI detectors and with Humanized AI, we will have Humanized-AI-detectors. What's next?