The title is of this post is definitely confusing if not misleading.

Besides, the title should probably have referred to it as "a giant open PR" or something, because I don't think what the submission is trying to focus on is the feature itself.

Oh, my mistake, I thought they were doing the zig thing again.

They didn't open a PR against zig either, the compiler concurrency work they did was also only ever in their own fork.