Most probably this is a resistive touchscreen, as one would expect in a non-consumer appliance.
Looking at service manual, on page 29 they suggest a non-abrasive pointer for calibration. Since no additional material requirements are given, it is clearly not capacitive or SAW.
Resistive touchscreens are quite easy to use with an ordinary MCU, and it only takes 4(in most cases) GPIO/ADC pins. In addition, they can be operated with gloves and are immune to splashing water (particularly important in kitchen appliance like this).