I'm not really familiar with the Castlevania series, but curiosity got the best of me here. A quick peek in the coding shows the source disc to be a Official PlayStation Magazine demo disc (the label "cdrom0:\SCE_DD\SCE_DD.ELF;1" via PS2DIS gave it away). You won't find this label in demo discs created specifically for a game. So, I looked through the game listings of the Official PlayStation Magazine demo discs, and found it to be Official U.S. PlayStation Magazine Demo Disc 75 (December 2003). This demo disc is available on the net.

Thanks for the upload! I'm sure someone really interested in the series will dig through it and find something of interest. From what I saw, nothing to grab your attention.

[b:439bb644a9]Update[/b:439bb644a9]: There is also a demo of it on Issue 79.

Happy New Year!