Have you ever had any rejection letters that don't quite make sense because they're so generic? So generic, in fact, that you don't know which organization sent them until you have read the signature stamp? And then, after you're read the email, you still don't know what you sent despite your meticulously keeping track of submissions?
I believe this rejection letter qualifies as one of those.
P.S. Come hear "Sounds from the Gray Goo 2.11" at the View From The Edge concert TONIGHT at 8 PM.