DC Demote left behind NTDS for the DC in Sites and Services. How can I fix this?

windows active-directory windows-server-2016 domain-controller

Can I delete the record?.

Yes. Deleting the DC object in AD Users and Computers/AD Sites and Services are supported methods of removing metadata of former domain controllers.

https://docs.microsoft.com/en-us/windows-server/identity/ad-ds/deploy/ad-ds-metadata-cleanup

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