I deleted my Apple ID but I forgot to sign out of my iPad?

From the article below.

• Make sure that you sign out of all your devices to avoid issues with apps that use your Apple ID account or iCloud. After your account is deleted, you can't sign out of iCloud or turn off Find My iPhone Activation Lock on your devices. If you forget to sign out, you might not be able to use your device when your account is deleted.

How to delete your Apple ID account.   *  

You’d have to ask Apple support directly, but my understanding is no (based on past posts here from people in the same situation), there is nothing they can do. When deleting a AppleID, it is imperative to sign the AppleID out before the AppleID is deleted. After it is deleted, there is nothing that can be done.

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

• ”Make sure that you sign out of all your devices to avoid issues with apps that use your Apple ID account or iCloud. After your account is deleted, you can't sign out of iCloud or turn off Find My iPhone Activation Lock on your devices. If you forget to sign out, you might not be able to use your device when your account is deleted.”