This is Tucker Kraft's first touchdown, and the decision here is pretty interesting. Kraft motions pre-snap to put the Packers in a 3x1 Nub look ("Nub" is when the only receiving option on a side of the field is the in-line TE) and the Steelers linebackers shift with the motion, putting Cole Holcomb [55] over Kraft.
The Packers are running an RPO: a wide zone run paired with a WR screen to the right. This is a pre-snap read, with Love making the decision on whether to hand off or throw based on the numbers/leverage to the pass side. If Packers have more receivers to a side than the defense has defenders, they'll throw. Likewise, if the Packers have an extreme leverage advantage on the receiver (in this case, Kraft), they'll throw. If neither of those things is true, they'll hand the ball to the running back.