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Because their methodology is highly questionable. It's not some objective scientific research or a real physical test (like crash tests).
Owners get the questionnaires, and some respond, while some don't. Hardly a representative sample.
But that is how polls work. And they are scientific and they do work cause if you use big enough sample, you filter out the statistical noise (within margins of error).
ps. I am not saying anything about the quality of this particular survey cause I have no idea about the sample size or the margin of error or it's historical accuracy. But polls if done correctly do work.