It's a list that is questionable, and unreliable at best.
There are so many situations where extremely similar cars have an exceptionally wide disparity in performance. Way too many.
One example, there is a full one second spread between a 66 Corvette 427/425 and a 67 Corvette 427/435, when there is no where near a 1 second performance difference between those engines, which only differ in carburetor and intake. The 66 is the second quickest car on the list, and the 67 is the 32nd quickest.
They have a mythical L-72 427/425 68 Corvette on the list, when that engine became the 427/435 in 1967, with 3 two barrel carburetors, and remained that way through 1969. Yet they do not have a 67 L-88 Corvette.
The disparities can only be explained by driver ability, "tuning", and track conditions. It pretty much negates anything resembling a factual list.
If you look around, you'll find that various vehicles showed up for those tests with trick carburetors and distributors, mauled water pump impellers, gutted alternators, and other tricks. Others were tested after months of abuse in the "magazine test car pool".
I suppose it makes "good reading" for the uninitiated.