Yeah, when the article skipped over the first two memory management strategies to point out issues with manual memory management and an "automatic" strategy that is unfinished or broken, it really struck me that it's quite impressive for a single author to have a functional, fast language with a working garbage collector
and arena allocator (with some issues) in only a few years.
The criticisms in the article, which I just read beginning to end, are largely about features it claims to provide (or claims are in development) that either no other language has, are an improvement on other languages, or are state of the art features in world class languages with hundreds to thousands of times more developer hours.
On the one hand, it's not wrong to criticize the overly ambitious nature of V's plans nor criticize the poor attitude and self-advertising strategies of its lead author. On the other hand, I'm not sure that the article is doing that, it seems much more interested in taking one of these features, showing that it doesn't work, and saying "so there!". But the fact that these are the features being complained about, not the core of the language, says something in itself.
Likewise, the fact that a hobbyist language with a single primary developer has terrible documentation is at the very least par for the course. Heck, I've found the Zig documentation horrific (in the past), and that has way more developer time and mindshare. Compare it to, say, the Oil shell (at least, where it was a few years ago), if you want to be fair.
I'm not convinced that the blog author isn't a troll, in some sense of the word. Clearly, many of their criticisms are well founded. Clearly, Alex does not react well to criticism. Clearly, V kinda sucks for practical use right now in a lot of ways that do matter. But the post (especially the end) feels like an excuse to stir the pot, not well-intentioned criticism. The author seems to want to use this post to counteract people they feel have mistreated them (with some justification).
Note: I say all this as a complete outsider. I've never written a line of V code and probably never will. My only prior experience is that I'm familiar with the controversy around V, especially on this site.