Using their torque data (inc. transmission loss) + weight (incl. driver) + gear ratios in combination, has given me pretty accurate acceleration results when compared to fastestlaps.com acceleration tests and it's something I've done and tested for hundreds of cars so i'd disagree with your statement of "it's not even close".TBH it was never acurate, not one car. Only a representitive curve nearly always far from reality.
Over the years of doing actual mod engines, I used many sources but never that place because it was not even close to anything real.
You should be researching actual dyno-plots.
Google for your desired "car/engine + dyno" and you can find real dyno values forr most efforts.
You can also interpet basic values first from hp/tq at x rpm to start building your own plot.
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