The screen of that laptop in the ad is 253x151, which is an aspect ratio of 1.67. That is neither 16:10 (1.60) nor 16:9 (1.78), so it has to be a rendering.
While likely a render, Since there is no way for you to measure the partial pixels (there is no one-to-one between reality and pixels), this math makes no sense. An edge pixel represents an unknown quantity of screen and lid.