Insane that the Luna Wolves are aware Horus is faking the Cthonian equivalent of a heavy Cockney or working-class NYC accent.
Loken knows that's what he's doing, he specifically notes Horus speaks in a rough working class Western Hemispheric Cthonian accent when everyone knows he did not grow up there, he was pretty much raised in the Imperial Palace on Terra. Like they know what he's doing and yet nobody finds it cringe as hell. It's just regarded as evidence of him being politically savvy. "Wow he's going out of his way to be relatable to his men, so impressive, he's so good with people"
The Primarch aura really is a hell of a drug because no way could anyone else do that and not get immediately clowned on.
Like in any other context, working class soldiers are going to look at their rich nepo baby commander going "Yo what's good, I too love buying loosies at the bodega" and just react with utter contempt. That would never be perceived as relatable, that would just be called poverty tourism or LARPing.
Horus is the 30 Rock bit where Jon Hamm's character genuinely believes he's a talented genius when he's really just mesmerizing people into humoring him by being handsome.