He explains the definitThat's what got me here as well. He explicitly mentions that some website had showed a letter featuring his real life name and address. But if that were to occur here, somebody within the thread would've absolutely known about it and if this is the site he DMCA'd then Null would've definitely spoken about it. So I'd go out on a limb to say that no, LP wasn't referring to this website. However, even if that leak got deleted in less than 24 hours, there very likely was more than one person that has witnessed it, so I say keep tabs on this thread if by any chance that letter resurfaces or somebody decides to make an account to post it here.