Dividend yield is the annual dividend per share divided by the price per share. The dollar income is the annual dividend times the number of shares. The yield falls when the price rises and the dividend stays the same.
A $2 annual dividend on a $50 share is a 4% yield. Two hundred shares at that dividend pay $400 a year before tax. The page does not assume the dividend is raised.
It does not predict whether the dividend continues, and it does not subtract withholding tax. Price change is not part of the yield.