No, his tent is 6 foot 8 inches tall. The Gavita is 13.4" tall itself, that leaves 66.6 inches of height. Subtract 48" needed between the light and the plants and then we are left with 18.6". Not too bad, we could grow plants that are a foot and a half tall maybe mainlining/fluxing. But then we have to factor in pot height. Let's say we run a short sea of green in one gallon pots, those are at least 7 inches tall. So we have to have plants no more than about 12 inches tall.
The Gavita DE was not designed and is not well utilized for tent growing, it's for grow rooms.