Does anyone know anything about this author? Is this likely something that's been developed for a business or is it "just" a hobby project (albeit a seriously impressive hobby project!!)?
Jorgen Lundman is also a main coder for the OpenZFS project afaik. I've seen his name many times since the very early betas of the OpenZFS macOS port that I've been using back in 2012/2013. I don't know how it's financed, but I'd think it's not just a hobby.
Oh that's good. Even if this turns out just to be a hobby project then at least the brains behind it is someone with real experience hacking ZFS.
Just a hobby, working on it because I want to :)
Your hobbies make my hobbies look pathetic. Kudos :D