I can't speak to that book specifically, but Rare Bird Lit is legitimate. They're kind of a niche publisher founded by someone who used to be at Book Soup/Vroman's.
Just bringing this post back to the top. Rare Birds has a range of signed books available, such as:.
Frank Bello (Anthrax), Trever Keith (Face to Face), Jerry A Lang (Poison Idea), Flake (Rammstein), Andy Biersack (Black Veil Brides), Matt Sorum (Guns N’ Roses, Velvet Revolver, Motörhead), Duff McKagan (Guns N’ Roses), Russ Giguere (The Association) etc.
Non musos such as Danny Aaberg (Big Wednesday), Chuck Palahniuk (Expedition – prequal to Fight Club)
If you search “signed” in the search function, you get a few different items to the “signed” tab.
Reliable company. I’ve only had one issue with an order and they rectified it immediately when I contacted them.