Hi - retired TA (male) here :
Yes, I would think this is probably right (but I stand to be corrected by teachers more expert than I).
Like in a recipe book, you wouldn't expect unnecessary descriptions, merely a list of equipment, ingredients, and the method, cooking time, temperature etc.
But there should be information about what the machine does, how it works, why it is better than other similar machines, possible snags or problems. Even environmental or cost details could be provided.
These kind of things can sometimes be done just as bullet points, not necessarily even requiring normal sentences, but DS has probably seen examples of the kind of thing wanted by the teacher, so should have a reasonable idea of what he is aiming at.
It should not be too brief, and should show that he has thought about the task carefully and not just done the minimum amount of work to see if he 'can get away with it'.