Delete a Apple account that’s locked out

You cannot delete an AppleID that you cannot login to. The ability to login to an account you claim is yours is required to prove you have legitimate control of and access to that account. Apple will not delete an AppleID unless you can login to it and in fact they have no mechanism to even request AppleID deletion without first logging into the AppleID you wish deleted.

See -> How to delete your Apple ID account - Apple Support

So to delete an AppleID, you will need to first recover access to it before you can request it be deleted -> How to use account recovery when you can’t reset your Apple ID password - Apple Support