Did you even READ this article? because it only proves what I have said from the beginning. Dynos are accurate unless someone purposely alters the computation factors. Yet here you are going around claiming Dynos are as accurate as a Crystal ball.
"While we're at it, let me explain something about engine dynos. People say dynos don't lie. Well, they don't... but the people entering the aquisition data DO, and if they fudge the numbers here or there (barametric pressure, relative humidity, air density, air temperature, the amount of water being fed to the water brake, etc.) then the dyno can only compute what it is told to compute. So in reality, no... the dyno won't lie, but it will give bogus readings if the data isn't accurately fed into the machine."
Were you even aware most dynos have sensors in place to read that information automatically so it doesn't get "fudged" ? Like Baro / Humidity / Temp, etc.