I don't like developer greed impinging on the Aviation uses of Airports but if
this was the submission to the ATT then I can see why the result went the way it did. The documents presents a number of facts that are fairly tenuous in regards to what the AAT has the power to do or to the current issue at hand. It reads like a list of issues that the chambers members feel upset about but many are peripheral to what the decision was about. Try to read it without the emotion of being involved and see if you would have agreed with the chamber of commerce position.
Despite what you might think judges and AAT Presidents are generally pretty sharp. They may not know the intricate details of aviation but they can understand the issues that are presented to them. Generally if they make a mistake like the takeoff distance required vs a touch and go it is because it hasn't been explained to them properly.
If you do take further legal action get some good advice and follow it. It is easy for you to be dismissed as an angry mob if you don't present reasoned arguments. You will need help from the politicians so muster public support. Don't publicly argue safety to too much, the public are wary of small aircraft and you dont want them thinking that the best option is to close the airport. But most of all don't give up.