Love Kenji!!! I have used this method for several years now, and hands down, it makes the absolute best turkey ever. I also dry brine my turkey for a few days, which I think is critical for flavorful, moist meat. Here's a link to the actual recipe:
https://www.seriouseats.com/butterfi...h-gravy-recipe
I'm not a fan of his gravy, so I use a different recipe, but the dry brined, spatchcocked turkey is SO good!