Or he might be thinking of the Knights of Gryphonne
http://wh40k.lexicanum.com/wiki/Knights_of_Gryphonne - who may or may not have ties to the War Griffons Forge World.
Scipio Africanus wrote:Uh, the world that Deliverance (Ravenguard Home moon) is orbiting is a forgeworld. Ravenguard are very clearly in dominion over that planet.
The Raven Guard
IA article specifically said "Between them, Deliverance and Kiavahr produce enough ordnance and engines of war to almost equal the production of a Forge world." not that it was a Forge World.
Note that despite their having a proper homeworld the Raven Guard also have a Chapter Keep on the moon of Baran, occasionally taking new recruits from said world, much like the Imperial Fists relationship with Necromunda, So its certainly possible the Iron Hands might have similar outposts (and they certainly did during the Heresy according to the Massacre)