Permanent deletion
How do I permanently delete devices off my account?
iPhone 7 Plus, iOS 13
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iCloud: Manage your devices in Settings on iCloud.com
You can use Settings on iCloud.com to see a list of your devices—iOS devices (iOS 8 or later), Mac computers (OS X 10.10 or later), Apple TV (3rd generation or later), and Apple Watch—that are signed in to iCloud using the same Apple ID you use for iCloud.com. You can also mark your Apple Watch as missing, and remove a device you don’t have anymore.
https://support.apple.com/guide/icloud/manage-your-devices-mm25565a6496/icloud