From Wikipedia.
The ACSI interviews about 80,000 Americans annually and asks about their satisfaction with the goods and services they have consumed. Potential respondents are screened prior to interviewing to guarantee inclusion of customers of a wide range of business-to-consumer products and services, including durable goods, services, non-durable goods, local government services, federal government services, and so forth. Results from data collection and analyses are released to the public throughout each calendar year. ACSI data has been used by academic researchers,[1] corporations,[2][3] government agencies,[4] market analysts and investors,[5] industry trade associations, and consumers.
So they get people, ask them for their opinion and they go off that. Now it does say those people are screened. But again, Samsung has a dirty past. Why can't they just do it again? And again I am not saying it like I'm 100% right. Because I'm prolly not.