The survey is still worthless, since Valve still won't tell how it's measured and won't correct clear mistakes (like single HD 8800 model, only sold by OEMs machines for one year, being more popular than whole HD 7800 -range based on same chip and sold for several years)
I feel like this has actually been addressed repeatably. The fact that the survey behaves EXACTLY like one would have forecast with the influx of Chinese users is actually the testament to its statistical validity.