I like chuck and brisket for chili, more fat and connective tissue than tritip.
Recipe looks legit. Reconstituted dried chile peppers are the key to making the best chili. They're less consistent, which is why chili cookoff guys tend to use their own blends of powders, but powders tend to leave grittiness, whilst blended rehydrated chiles are smooth and pure. The vitamix comes in super handy here.
He says the comino is optional but it definitely isn't, and I'd double it for 4 lbs of meat. I'd also use about 1.5x the amount of chile peppers for 4 lbs of meat. No allspice or cinnamon please and thank you.
Also, I don't like masa harina in my chili. I can taste the corn and I don't like it. Chili OVER corn products like cornbread or Fritos, is good. Corn IN chili is about as good as corn in beer, which is to say, not at all. And it's not necessary as a thickening agent anyway. If you're using rehydrated dried chiles, their skin is a natural thickening agent, as the chili cooks.
I also stay away from hot sauce and/or vinegars, I don't like what they do to the flavor of the chile. If you want more heat, add cayenne 1/4 tsp at a time until it's hot enough for you. Or just go with hotter chile peppers in the original whole chile blend.
But overall that recipe is definitely workable. Way better than the "3-bean chicken chili" that won our last holiday pot luck chili cookoff. 4/5 of my team is not from Texas and many of the aren't from the USA at all. SMH.