I do not think the author understands what scaling means.
"A scale factor is a number which scales, or multiplies, some quantity. In the equation y = Cx, C is the scale factor for x. C is also the coefficient of x, and may be called the constant of proportionality of y to x. For example, doubling distances corresponds to a scale factor of 2 for distance."
For example, the first set of benchmarks:
ATI Framerates
3870 X2: 72.0
3870: 32.2
Scaled: 72.2/32.2 = 2.236
You get over double the performance from a single 3870 card. Some kind of synergy exists in the 3870 X2.
another example:
3870 crossfire: 59.3
3870: 32.2
Scaled: 59.3/32.2 = 1.8416 - approaching 2x the performance
Nvidia:
8800GT SLI: 82.2
8800GT: 50.7
Scaled: 82.2/50.7 = 1.621
In every single benchmark posted, the 3870 crossfire and X2 scale better than the SLi'd 8800GT's.
Doesnt mean they get better overall frame rates though.