If you click through the link to the survey itself, it's to a Life360 survey of 1200 adults who use the app.

It's technically true that some of those 1200 respondents may be 18 or 19, but the survey was limited only to those who have actively chosen to continue using the app after they reached adulthood.

The voices of those under 18, and of those adults who reasonably said "hell no" to location tracking by their parents after they reached the age of majority, are simply not reflected in these results. This makes the survey hilariously biased and not in any way reflective of general teen sentiment towards location tracking.