Disabling DB Authentication

Hello Team,

We’ve got a request from customer, that they would want to disable DB Authentication.

Below is the exact reason, given by the customer, on why they want to do this:

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For security reasons, we don't want users to be able to still log in via Db if their credentials for SSO via Google have been disabled. We're protecting everything via SSO and VPN, so don't want there to be a potential alternative login method.
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The above seems to be a valid case, however as we can’t disable/delete DB authentication, can you please share your inputs on this.

Thank you.