That is only one mode out of the many....what about continous AF and etc so a sweeping statment like that should not be made.
1, As stated, it's a STATIC STUDIO comparison. So it's well lit, the subjects are not moving. Ergo, AF tracking and locking on to targets in dim light is not covered.
2.Continuous AF was NOT accurately tested on your links based on the text they themselves put in:
"This mode usually shows no speed increase with our static subject; we have no way to measure performance with moving subjects."
What we are talking about are real-life examples. Like when in a dimly-lit-studio (dark theme), owners of certain camera brands had to use a flashlight on the subject so that their cameras could lock focus, while others didn't need that at all.