(The erstwhile code of conduct is now labeled a 'code of ethics', and AFAIK SQLite has no official CoC currently.)
Given that SQLite isn't really open to contribution (one of libsql's frustrations) it doesn't really worry me that they didn't & don't have a clear code of conduct. To me, digging through the repository [ETA: the website, rather] for what amounts to a cringey Easter egg and then linking to it as if it were a serious issue is uncalled for. To be honest, I think the complaints shouldn't stayed out of their announcement entirely - they have a legitimately cool vision for what their fork could be, and the complaints were only a distraction.
You didn't have to dig through the repository to find the CoC. It was right there on the website at /codeofconduct.html: https://web.archive.org/web/20180315125217/https://www.sqlit...
Following the document itself, it should be rewritten if it ever intends to include other people, and should be explicitly clarified that the current form only applies to the author himself.