where did it say on that link they would be showing the A4 there?
You missed nothing - it doesn't say they are showing it. The idea is to ask them IF they are showing it. We don't need to see an ASIC, there's already a video for that. We want to see a board or controller.
Re-open the dialogue, push them to communicate, and demand an update for the main page with new information. They've taken a lot of money from a lot of people - they need to be held accountable for their (lack of) actions.
Waiting until September 30th to communicate with them and hope for best doesn't seem to me to be in anyone's best interest.
What can people do? Storm the factory and demand a demo? All anyone can do is wait and hope for the best. If they are honest business people then they won't leave A4 buyers holding the bag. ASIC machine builders don't have the best track record.