Not quite. But almost. As I understand the OBD-II interface, it's not directly compatable with a PCs serial port. The cables on that site seem to provide a way of connecting the standard OBD plug to a standard DB9 plug. But, from there, you still need some hardware to convert the line signals to one a PCs serial port would understand.
Check out #1 in this faq.. it seems to back me up.
And here is an example of a homemade OBD bridge.