Not a great test. 8 years out of date, and they're putting the SB X-Fi against more expensive (the Lynx22 was $600) studio-quality interface cards.
Also this at the end:
Sound Blaster X-Fi - The built-in band limiting at 24KHz and rising noise floor above that make the card useless for wide-frequency testing. However, it had the best distortion performance and very low spurious signals on both inputs and outputs. This should probably be the best sounding card of the bunch.
Poor frequency response (outside normal hearing range) but otherwise good.