> Was the conversion assisted?

Yes. Comment by mold's author:

https://www.reddit.com/r/rust/comments/1w45j6n/comment/p7ac5...

He decided to use LLM assistance exactly because he's an extremely competent guy.

Assisted, yes. Claude is a coauthor for some of the commits and I think he also said that explicitly. Vibe-coded, he claims not.