You can run a 4-3 without four DOWN lineman. One of them can be an elephant position in a two point stance. But their depth, gap and assignment will tell you whether its a 4-3, 3-4 or hybrid (doing some of each from same alignment).

I have to rewatch to see it. But from Thompson, McCarthy and Capers comments, they are running a 4-3 with an Elephant end and substituting Neal/Peppers for Guion in nickel and dime from what little I have interpolated.