That fits with what I heard about before, which is that adult domains are often ignored. Altho I have personally seen mainstream domains also get that letter back on the first request.
Now, I gather that you can pursue it past that point (I don't know the method, I'd have to look it up), and keep sending letters, and they switch the case to a different part of the google bureacracy. DD probably would know something about this part of the process.
Now, there is another theory on how to recover a permanent zero, which is that if the domain is dropped and repurchased it sometimes regains pagerank. If that theory is true your domain might "self-recover", and all you have to do is wait.
Let us know if it self-recovers.
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