What satirical technique is used in this picture when the advertisers are saying that it is cooked at 50 degrees while it is actually being cooked at 180 degrees?
In advertising, amongst the most important things to consider are the target audience and the intention of the advertisement. Various techniques are used to convey a message and using visual images is usually very effective.
Without knowing the context of this advertisement, I will assume that the advertiser perhaps wants to introduce its target audience to a stove that can be set using a modern device to avoid ruining the food, associated with older stoves that do not have all the modern additions.
Satire generally makes fun of human failings and,in this advertisement, it would be common for the cook - after the disastrous result - which we the audience can anticipate (irony) - to blame the stove and its inadequacies when we know the cook is just not very good! The large dial - clearly indicating the temperature of 180 degrees also foreshadows what we know, adding further humor to this visual image in its exaggerated form.
The "thick and smooth texture that you all enjoy" will have the audience laughing to themselves as they know what the outcome will be. The use of these words adds realism to the event and intensifies the satirical situation and the incongruity is not lost on the audience as the words become strangely out of place in an oven where the food is about to be anything less than perfect.