Apparently so, but it makes little sense considering that his castle is in, what we assume is, another dimension. Why would the brotherhood be there?
Theory time:
Since the Castle exists outside of time and space as a physical manifestation of Dracula's power, and given the presence of Clerics who can enter through portals and summon knights- Im gonna say, that the knights you face are all summoned there by Clerics. But given that the Casyle is outside of time and space, they are unknowingly summoned to it not in the material world, but that pocket dimension. So Modern Dracula, in his castle, which is a pocket dimension that is also technically in the modern time, is getting Brotherhood warriors from centuries before.
to simplify: Dracula is in present day, but the brotherhood warriors, in their respective timeframes, are unknowingly being sent via portal from the past, to that time displaced Castle. Dracula is literally fighting people that not two seconds before they were summoned, were still fighting Dracula's armies back in ancient Wygol.
Does that make sense? Because I think its neat.