Eh I changed it as a gag back on Rerolled because it freaked people out. The lulz are long gone but I've just been too lazy to have it changed back.
As for Sovereign, he wasn't the 'leader' of the Reapers even back during ME1. He was a pathfinder/vanguard that was investigating why the Citadel had failed to activate, and Vigil speculated that it might have taken centuries for Sovereign to figure out what the Protheans had done due to his need for absolute secrecy. Conversely, Harbinger chills at the base beyond the Omega Relay, possessing collector drones rather than engaging you directly. So while they didn't directly say 'this dude is in charge of everything', he was obviously much more important than Sovereign, and definitely more of a general than a soldier.
Nothing in Leviathan actually goes against anything Karpyshyn wrote. In fact it fits so well that I would assume it was based on notes of his or something, which means he essentially did write it.
