Like others have stated, all I can figure about the defensive strategy going into the game was that they were concerned that weather/field conditions were going to favor the offense, and trying to have your corners back-pedalling and flipping their hips trying to cover Chase and Higgins with man wasn't going to work. I heard somewhere it was Hairston's first time playing in the snow. But Burrow and those receivers (and Gesicki) were just too good.
I'm not defending, but rather speculating.
FWIW, I don't think he's alone in that regard amongst NFL coaches.