You haven't tried it yourself, have you? Inno has a long standing policy NOT to revert deleted buildings - AW in particular - that you can, in theory, rebuild. No matter how expensive that would be. The only one-time exceptions are event buildings that you can't get again, those may get restored, once.@Crazy Wizard, next time you accidentally sell of your AW, send a message to support, they might be able to help you before you have to rebuild it.
And yes, I have a first hand experience with asking support about accidentally deleted AW.