It's pretty trustworthy in my experience, but it's also an anonymously-editable wiki and has had bad mistakes. One relatively recent one I remember is that the Splatoon 2 composer breakdown was total guesswork and was completely revised once the soundtrack album came out.
It, like everything else, doesn't explain why "N.KAZUO" is Hanzawa, so I'm not all that interested in taking its word for it. I'd guess it ultimately just derives from GMCL, like everything else. ¯\_(ツ)_/¯
|