The method for high heat brisket would not work for a tri tip, it would come out way overcooked and tough. There's not enough connective tissue in a tri tip to put heat on it for that long.
The optimal ways to cook tri tip are (in order, in my opinion) 1. santa maria style flipping it every minute or so over a hot direct fire and 2. with a reverse sear, indirect heat taking the tri tip to an internal of 100 or so and then searing over hot fire until it's your desired internal temperature. Seasoning in either method is up to you but I prefer simple with just salt, pepper, and garlic powder.