I would not consider any button on a touch pad to be a disconnect, no matter what the they decided to label it.
The power is still going to the control board inside the appliance. These things usually have a solid state relay controlling the power and that can easily leak enough current to kill you without ever exhibiting any kind of fault to the user.
I really like a real disconnect device on the wall or a plug so you can pull the cooking appliance without any power in the pigtail or anywhere inside. In these kinds of things, a fault in the pigtail or connector is as dangerous as anything else. You certainly do not want to be holding that oven when the loose wire energizes the case. If you are lucky it just shorts, pops, trips the breaker and you drop the oven on your foot.
