Error 53 during iPad Air 2 restore after deleting Apple Acccount

Apple warns that you must remove an active Activation Lock (by disabling Find My iPad on the device) prior to actively deleting an AppleID from their servers. This document refers:

How to delete your Apple Account - Apple Support

While the Find My iPad service is enabled on the device, the device can only be re-activated using the AppleID credentials that were used to activate Find My.

If you have deleted the AppleID account (as you have indicated) you cannot disable Find My - and have therefore permanently disabled the device.

A deleted AppleID Account cannot be recovered after deletion; deletion is permanent. Apple Support will not be able to recover your AppleID - which, if Find My iPad was active on the device when the AppleID was deleted, is inextricably linked to the Activation Lock.

Error #53 is detailed here:

If you see error 53 when you update or restore your iPhone or iPad - Apple Support

You should note that if the AppleID associated with the iPad has actually been deleted - and an Activation Lock is encountered - you will be permanently locked-out from the iPad.

you can reach out to them by following this link

Activation Lock - Support

or their support channels

 Get

Support (apple.com)

And

or

 Contact

- Official Apple Support

And

or

Contact - How to Contact Us - Apple

Or

Genius

Bar Reservation and Apple Support Options - Apple