You will need to contact Apple as you cannot bypass the activation lock from the deleted Apple ID.
Activation lock makes a stolen Apple device useless.
Apple ID Support -
https://support.apple.com/apple-id
World-wide Apple Support -
https://support.apple.com/en-us/HT204169
Support by phone, email or chat -
https://getsupport.apple.com/
Apple Support by Twitter -
https://twitter.com/AppleSupport
ASC - Late 2012 Mac mini, macOS 10.15.2; Watch, series 5 GPS/cellular, watchOS 6.1.1; iPad Air 2, ipadOS 13.3; iPhone 8+, iOS 13.3; TV 4th Gen, tvOS 13.3; HomePods, audioOS 13.3 and Airport Express w/ Airplay 2