The title says 'standard library'. Are you saying that, in the context of C, that it is an error to take that to mean an implementation of libc?

Yes, I know the author's writeup then goes on to say that it is not a libc with a pile of questionable justfication. This is a custom runtime, in a single header no less, which is admittedly impressive, especially considering it provides runtime and thread safety primitives. This does not rise to the level of claiming the idea of a 'standard libarary' though, IMO. In that, I think the author misses the point.