Because unlike your good self, most people know what conditions this time was run under. I have photos of the smoke pouring off of the small, radial tyres even at the moderate 20psi boost level used for these passes. Are you missing something? Probably not. Just keep in mind that magazines tend to talk about the best power a car has made and the best ET/TS a car has run HOWEVER these two figures may not go hand in hand at the time.
The car setup was atrocious for this power level. Although the run was made on slicks it was made with the factory manual transmission and was a handful to drive. Mechanical problems made a run with the Powerglide impossible at the time. When did he use the nitrous (N2O btw)? How much power did it make when it ran? You have no idea.
How on earth does a 2-litre 4-cylinder apply to this discussion????