When they say "they could detect a bump on the North Pole the height of a single sugar molecule" is not about the accuracy of the measurement? If my measuremen

When they say "they could detect a bump on the North Pole the height of a single sugar molecule" is not about the accuracy of the measurement? If my measurement device always measures 42 it may by hyper-precise - but it won't helping me to detect a bump on the North Pole the height of a single sugar molecule nor anything else.