So...Google is strong arming ISPs to deliver the bandwidth they promised (which you paid for), and that's bad all of a sudden? And I think you can't fathom the amount of traffic that YouTube gets, so your sense of "margin of error" is probably orders of magnitude off. And at the end of the day, if I don't get my HD stream, then I don't have an HD cat video stream. I don't fucking care if it's within your "margin of error".
If you don't like this tool, well, go find something else that is reasonably objective, not "optimized" by the ISPs, and comes even close to the confidence of this data. Good luck with that.