There is nothing about this problem in this DD. Scaling <> TV Overscan. With scaling the UI elememts get smaller or bigger, but their position on the screen doesn't change. Here the problem is the overscan of TV's which do still add a overscan area to the output as default (which is completly wrong today). This option must be turned of in the TV or if the TV doesn't suport it to disable, it must be done by the game. The UI elements must then be paintet in a smaler inner rect on the screen.
But as I did write, whoever can turn off the overscan in its TV Settings, should use this, as it is the much better solution, as you then get a 1:1 pixel image on the TV screen and not a bloated up and interpolated picture.
The OP post title is missleading, as the problem has nothing to do with scaling. It is the overscan of TV's which put a bloaeted up picture to the screen (some amount of the image borders gets cut off / is not visible), instead a pixel per pixel (1:1) image.