RoadRunner - did you have Aero installed before on an iDevice running 4.x? Or 5.0.1?
What I've found is that, somehow, the "not compatible" overrides don't work (don't kick in?) if you've previously purchased the tweak and had it running on a "supported" device.
For example, I have AnyAttach running on my iPad3 with iOS 5.1.1 but Cydia tells other people, who are trying to buy it for the first time, that it's not compatible with 5.1.1.
I don't know what affect it has, running a tweak on a device that Cydia says is not compatible. But, so far, things appear to be going well with my iPad3 (and your Aero, I assume, RoadRunner).
So, that explains what's going on. Doesn't help in others downloading it, or Explain, really, why it CAN be downloaded by those who already have it. But, that's what I've seen...
Marilyn