Hi Paul. Great post. Thanks for sharing it with us. When flying the Mavic 4 Pro and Mini 5 Pro under RTH, I’ll often get a similar type of message. I think it’s part of the AI to help us remain safe while the drone is airborne. Be well...
Thanks for the clarification.
So, the answer to the OP's question of,
"Can he unbind it via a web browser, without giving me his login details?"
is, "Yes."
The previous owner can unbind it remotely from a web browser with his login details...