Maybe they were thinking of the options most browsers have to clear selected private data on exit. In that case, though, it's still possible to clear both localStorage and cookies I am sure. Maybe parent commenter currently has the options set so that cookies are cleared but localStorage is not and that's why they thought that this is the way it always is.
>Pretty tight that computers can drop acid now.
Anyway, here's a direct link to the video for mobile users: https://vimeo.com/169187915