"Basically it is: The method will select two horses in selected races. It finds the winner in 45% of these races with an average winners dividend of $4.50."

100 races = 200 bets
Returns 4.50 x 45 = 202.5

1.25% POT by my reckoning???
IF (IF, IF , IF) you can do this consistently, then bet flat stakes at the best odds you can get and retire this time next year.