The first version of Kanon to get voice acting was the Dreamcast version, which I own. I believe the Dreamcast voices are the same as the PS2 voices, and the voices were ripped and the PC version patched to be compatible with the voices, so either way you’re correct.
And don’t worry about it. People are curious as to how to get the game in English for the Bookclub, so what you’ve said is relevant. I hope to see more from you as the Bookclub starts up. 
