Legally he must inform in advance if he indents to sell large amounts.
According to what laws? BTC isn't a security and Craig Wright is not a company insider. He doesn't need to disclose anything under any law I've ever heard of.
There's no such thing as "insider trading" with BTC so he doesn't need to use
a 10b5-1 plan or anything like that. And if he were trying to comply with Rule 10b5-1, his little social media FUD doesn't meet the requirements.