Signing your opinion with your nick or name has nothing to do with doxing. It's not like we're talking about his address and SSN. But if you don't like the word "vitriol", use "FUD" instead, because that's what it is. There are lots of things about MS SQL one could point out and say: hey, this is broken. But the vast number of statements on that page are empty, misleading or simply untrue.

That being said, I don't think this site is that harmful. People who'd eat this content up won't read it (tl;dr) and people who do read it will most likely have their own opinion anyway. It's not an authoritative source people tend to trust like, say, Wikipedia, so I'm not bothered about it personally.