Using Dracula's throne to revive is a really bizarre concept by the way. I wonder if it isn't just a translation goof.
I don't think it is, because Brauner's whole shenanigan is separating Dracula from the castle through the Throne Room. But I ALSO think it may be not a "requirement" to ressurrect Dracula like this line makes it looks like.
Maybe Death was referring to the fact that in this specific case, Dracula needed the throne because he just happened to be in the Throne Room replenishing himself when Brauner separated him from his castle, thus breaking his connection with the source of his powers. Or maybe Brauner interrupted Dracula's ownership of the castle before he could establish it, thus leaving him in an incomplete ressurrection state.
Except for the ownership concept, on which the entire game hinges on, never mind the rest. Death is quite clear on the revival thing, and leaves no room for so much interpretation. Jonathan also confirms right after that Dracula is the one restoring the castle's power, not the contrary.
BUT the conversation with Eric right after this seems to imply that Brauner indeed sealed an incomplete Dracula, and not an "totally unrevived" one:
Eric: This power! Has Dracula been revived?!
Jonathan: Afraid so.
Charlotte: Brauner was sealing Dracula away, so when we destroyed
him...
Eric: Strange Even Brauner's seals would be easily Broken by
Dracula's power, and yet--
Charlotte: !! Perhaps Dracula still hasn't revived completely!
Eric: Perhaps.
Doesn't the intro for Portrait of Ruin also support this? From what I remember, the return of Castlevania was a result of the deaths of millions during WWII. Plus, I'm not sure if the canonicity of Ricordanza of the God Abyss is completely legitimate.
I think it's safe to assume it as canon, as it was supervised by IGA himself, and there is no word on the matter about it being non-canon. And we know IGA is somewhat nuts over canonicity of his storyline as he himself has stated many times before (A recent talk I had with T. Rodriguez confirmed that IGA worries/worried a lot about the whole "canon or not canon" debate over Castlevania).