> Reviews.org surveyed 1,000 Americans 18 years and older with a +/- 4% margin of error and a confidence level of 95%. The survey results were weighted to reflect characteristics of the United States population using available data from the US census.
Absent them explicitly saying otherwise, I think we need to assume that the survey was done of reviews.org visitors. Reviews.org has reviews for exactly three categories of services: internet providers, mobile phone plans and services, and TV and streaming.
Weighting for US demographics isn't going to make this sample very representative—this survey is of people who are browsing reviews for a set of products that most people don't think too hard about, which also happens to be a set of products that is tightly related to screen time use.