That’s a federated IDP which can be used to access your identity instead of using your social security number. It doesn’t replace the fact that your social security number is still your username and password in the canonical identity system, which is the problem GP is talking about.
Edit: or if you prefer, your SSN is both your user record locator and user secret.
The cause of identity fraud is lack of authentication, not existence of SSN. It's equivalent to going to a bank and telling "I'm Elon Musk, give me my money" and then complain that we must eliminate names to prevent this kind of fraud.