KFC reveals paper-thin grease-proof 'Tray Typer' so you can text and eat junk food at the same time

The 4mm-thick Tray Typers, which were made available for a limited time in Germany, allows you to tap messages mid-meal while keeping your phone screen grease-free.
http://www.dailymail.co.uk/sciencetech/article-3089971/Want-fries-keyboard-KFC-reveals-paper-grease-proof-Tray-Typer-text-eat-junk-food-time.html
DOES IT WORK WITH TACOS?