I agree. The only thing they are saying is that you will not be considered well if you ever want to go back there. They would get themselves into trouble if they shared performance with third parties. To be honest, something made you want to leave. Whatever that thing is will still be there in the future. So it sounds like returning would be out. Still, people move in and out of positions and in all likelyhood any future application you might have with them culd be considered. They woudl want to know more details about the statement. If you say what you said in your post I'd say you might be OK.
As you will see, I told them, in no uncertain terms, to see Figure one. -- Dave "First Strike" Pare