This refers to the hosting site (YouTube), not medium.com. They are advising you that whilst they are observing the policy, YouTube is not. See https://medium.

This refers to the hosting site (YouTube), not medium.com. They are advising you that whilst they are observing the policy, YouTube is not. See https://medium.com/policy/how-we-handle-do-not-track-requests-on-medium-f2b4b4fb7c5e#.j43fho4d2 https://medium.com/policy/how-we-handle-do-not-track-request...