Google authenticated user getting 500 response with no content

listen-to-this.netlify.app is the app as described in my own post: Internal Server Error 500 with no logs for new Netlify Identity account

How come it’s nowhere documented that identity is deprecated? (like in the documentation for identity for example: https://docs.netlify.com/security/secure-access-to-sites/identity/)

I wouldn’t have invested any time to use it if I knew this in the first place.