The guy who wrote that article has very little clue about what he is talking about. Here's why. The synth is playing EXACTLY in the key of C#.
In that article, Peter Kirn contends that the keyboard intro was recorded in the key of C at a sample rate of 44.1KHz and the recording was accidentally played back at the wrong sample of 48Khz, placing the keyboard in the key of C#.
It looks good on paper, but in reality, that makes no sense. If you take and record a middle C(261.63 Hz) at 44.100Khz and play it back at 48Khz, the resulting note is about 285 Hz where C# is 277.18Hz. And because tonal intervals to our ears are logarithmic and not linear, 285Hz sounds much closer to D and it sounds NOTHING like C#.
What you have is a keyboard playing exactly in the key of C#. If you listen, Wolfie is also playing in C#. If the drums could play in key, they too would be playing in C#.
A sample rate error could have NEVER placed the keyboards in exactly C#. But that is where the keys are. And the keys are right on with the bass guitar.
Van Halen ALWAYS plays "Jump" live, in the key of C#. In the studio, it was recorded in C and Eddie tuned 1/2 step down in the studio.
What happened? Eddie has a specific guitar that he uses for Jump. A guitar which is tuned to 440. Eddie either forgot to grab that guitar, or grabbed the wrong guitar.
And another thing.... If you record in a digital format @ 44.1Khz, you cant accidentally play back the tape at 48Khz, because its the tape that contains the information that tells the playback deck where the sample rate is to be set at.