Outside of the fact that this really isn't a thread to be pimping this in it's probably worth noting that it also deviates considerably from the standard histories and identities of the various archfiends in a number of cases. The flavor isn't bad, I can't say that, but it's not at all on the same page on a good many things with how it tries to reinvent some concepts, changes names of creatures, renames species of fiends, and some other fundamental alterations from the canonical vision of the lower planes.
Overall it's inspired homebrew, some of which I appreciate and some of which I don't care for, but when it discusses the Abyss or the 9 Hells of Baator it's not really talking about the same lower planes as I often am given how far it alters some things. Keep in mind guys on DF, I think it's a bit of an awkward disservice, and a bit misleading, to push it on half the planar threads that have been popping up lately.