Wow... arrogant as always.
And why do they release a game now under the Akumajou Dracula brand?
Well, I think the main reason is that the "Dracula" cat is out of the bag now, so to speak, where that part of the game was tightly under wraps when LoS1 wasn't out yet. Kinda like IGA's reasoning for the name switch when Harmony of Dissonance was being made - that he wanted to introduce the idea of other non-Dracula antagonists.
And to be fair, I'm certain that LoS1 had nods to the Japanese title in the knight scrolls. Seem to recall the phrase "the demon's castle" or "demoniac castle" being thrown around. It's kind of weird to make that switch mid-miniseries, though, especially when there's the possibility you've brought in new fans who've never played the older ones.