We're used to errata and fixing up stuff produced by humans, so if we can fix this resource, it might actually be valuable and more useful than anything that existed before it. Maybe.
One of my things with AI is that if we assume it is there to replace humans, we are always going to find it disappointing. If we use it as a tool to augment, we might find it very useful.
A colleague used to describe it (long before GenAI, when we were talking about technology automation more generally) as following: "we're not trying to build a super intelligent killer robot to replace Deidre in accounts. Deidre knows things. We just want to give her better tools".
So, it seems like this needs some editing, but it still has value if we want it to have value. I'd rather this was fixed than thrown away (I'm biased, I want to learn systems programming in zig and want a good resource to do so), and yes the author should have been more upfront about it, and asked for reviewers, but we have it now. What to do?
Personally, I would want no involvement in a project where the maintainer is this manipulative and I would find it a tragedy if any people contributed to their project.
Maybe it's unfair to judge an author's current opinion by their past opinion - but since the piece is ultimately an opinion based on their own experience I'm going to take it along a giant pile of salt that the author's standards for the output of AI tools are vastly different than mine.