Like the other person said, you've already become a data point by visiting the page.

Nothing about it needs to track the user. The only info you give them is that you can speak a certain language. Not that it is your main language. Or that you can only understand one.

Needs to, no, but they will. Regardless of whether or not it's your main language, you will be a data point by selecting your preferred display language. Unfortunately, of course.