I might be missing something here but aren't Dyno numbers extremely subjective?
I have never Dyno'd a car, but since 1992 (first race bike) I have Dyno'd all 13 of my race bikes, not just to know the hp/tq but as part of tuning process on carb'ed and 2-stroke bikes. Almost every Dyno I have used, the numbers varyied by quiet a bit depending on the weather and several other factors. I have dynoed 3 different same year/engine size (stock) Suzuki GSXrs and they were a good 5% off in hp numbers on the same day (same hour).
The above variation was on machines with between 110-140 hp.
Given the high output of the S62 engine I would think that the numbers would be a lot more "off" even if they were off by 3%-5%.