I say the question is funny instead. There is no such thing as fairness in this case. That site's review are all catered to how image being produced on digital platform, not the lens itself. Nor do they claim to be testing the lens for the lens alone.
See I suppose people are so engrossed in data and forget that Lens, as it is, is just part of the whole image making platform. What those test do is to show how the lens work in a certain environment. And that environment just happen to be digital capture, on APS-C sized sensor.
The same lens of course might yield different data when used on different platform. Its just a nature of the setup, but IMHO data is pretty much telling the story, and in this case, how that lens work on that setup. most here on this forum , IMHO, had set too much emphasis on the lens but lens alone and fail to appreciate other aspect of the image making platform. To me these data is to their intended audience more important and useful than a true lab data that only those that are measured on lab equipment, as the data reflect far more the truth; how those lens work on real world equipment instead.
So yes, even if its lens from Zeiss or Leica, Data as Data goes, are not always telling the objective truth. Its telling the objective truth only for that lab environment but not always what it is in real world usage. That is why real world experience is in many case, an important aspect of judging how a lens / platform / image making / image quality goes