Thanks for the heads up. I just checked the site through several browsers and proxying through a VPN. There's no typo and it properly links to:
https://github.com/Tongyi-MAI/Z-Image
Screenshot of site with network tools open to indicate link
EDIT: It's possible that this issue might have existed in an old cached version. I'll purge the cache just to make sure.
The link with the typo is in the footer.
Well holy crap - that's been there for about forever! I need a "domain name" spellchecker built into my Gulp CI/CD flow.
EDIT: Fixed! Thanks soontimes and rprwhite!