That video was painful to watch.
"Goku increases his ability proportional to the strain he trains under". This is the base on how they judged Goku's power yet its completely flawed. Since in the Andriod saga Goku stops training as intensely because he realizes that there's more then one way to raise your power level. He even tells Vegeta this. After this point Goku continues to train under much less stressful environments yet increases in power and strength faster then he ever has before. The people obviously have never watched DBZ in its entirety before or they would of scene this. I also thought the multiplier for some of the SSJ forms was not known? Yet they seem to use them there.
They also judged his speed by his travel along snake way in the Saiyan saga. LOL.