NO! Look at his edit:
EDIT: Cure #1 is added at 1.3 grams per 17 grams of salt, sugar, spices etc.... That give a final amount of approx. 170 ish Ppm nitrite when 18 ish grams of mix is added per pound of fish... Max. allowable nitrite in salmon is 200 ppm nitrite.. that allows for errors in additions of the mix... 15% either way still makes a safe and acceptable product......
He makes up the entire mix, cure and all, THEN uses 18 grams of the mix per pound.