If I had done the analysis in that blogpost (whose factual accuracy you corroborated) myself, I would have come to the same conclusion. Fortunately, the internet allows people to publish blogs where they share such analyses, so that effort doesn't have to be duplicated.
> 0.3 pretty clearly means it's not production ready software.
Despite the version 0.3 being visible, it is obvious that many more people than normal find that the wording on Github and the home page misleading (me included!). Obviously, this is a bit subjective, and I am telling you what I, personally, would have found a better signal to hone my expectations.
If you're interested in why that might be, I think it's because several other software projects I've used that are pre-1.0 don't have major bugs that interfere with their primary value proposition (like in Vlang). Off the top of my head, neovim, rocket (a rust webframework), mypy, reqwest come to mind.