So I see a few problems with this, number one, some of the smartest people I know make terrible coffee. Number 2 I'm sure some people with really low intelligence can make great coffee, I can also imagine a closed system narrow AI to be trained on enough data to complete this task with no general intelligence, fun fact, I just asked gpt2 to describe the steps in making a cup of coffee and it was extremely close, (apart from boiling the water) so much so that gpt3 would have no issue with it I'm guessing. Add some image recognition, some motor function and I'm pretty sure a few current AIs could accomplish this in 99% of situations.