You will not be able to that. Not sure where you got the information that you could do that after 7 days. Deleting data associated with an Apple ID is much different than being able to use that same Apple ID again. You may find this information helpful from the Support Article that deals with deleting your Apple ID.
When you delete your Apple ID, Apple makes our best effort to delete all personal data associated with your account. However, we are required to retain past transaction information for financial reporting purposes, and we may be required to retain certain information to comply with a court settlement or other ongoing legal procedure. We also retain a one-way hash of the email address of the deleted account to comply with legal obligations, and for so long as necessary for the legitimate interests of demonstrating our compliance with data protection laws and for account security. This hash of your email address will be retained as evidence that Apple complied with your deletion request.
How to delete your Apple ID account - Apple Support
More information is available in Apple's Retention Policy here:
Where you make a purchase such as a subscription, we retain personal data associated with your purchase for the periods specified by applicable laws relating to financial reporting, which vary by region. For most customers, that requires at least a 10-year retention period, but in regions such as China that period can be 30 years. We may also retain a record of your interactions with iCloud-related services. These records are typically stored for 30 days but may be stored for up to three years in an aggregated form, unless we are required by law or legal process to store them for a longer period.
If you delete your Apple ID account, we retain a record of the deleted account to comply with legal obligations, including as described above, and for as long as necessary for the legitimate interests of account security. If you choose to create a new account later, you will need to use an email address that is not associated with the account you have requested we delete.
Legal - Apple ID & Privacy - Apple
