No, what made Millar's writing liberal was them overthrowing dictatorships, Bush licking Magneto's feet (in Ultimate X-Men), the Authority slaughtering a secret committee representing the G8 nations, throwing a Cheney stand-in into Iraq. And don't get me started on his Ultimates...
I know what the editors said. But they were either lying (which is standard fair) or have very messed up ideas about being objective.