[oauea]

Nice, that page and your post is basically an ad. You don't need a proven open standard, you need our custom protocol instead!

[pmh]

From a quick glance, it doesn't look like a protocol per se, but a user management system akin to Keycloak. Those solve a slightly different set of problems than OIDC or OAuth

[vwpolo3]

It explains why OAuth2 is hard to use and does not solve login, registration, sessions, profile management, mfa, and proposes another solution. It’s all open source! :)