It's not cov3, they rotated to Tampa 2. So AR is trying to hit DK down the middle but the Mike & Safety play it perfectly. As he realizes the window may not be there for the Dig route due to the nickel, he checks it down. So the out route is not an option based on this cov.
Why are we immediately checking the ball down here? Clean pocket, beautiful step-up window. Front side out route is wide open to Germie. Miiiiight be able to work backside to Rome as he clears into the 2nd window past Gonzo, but the first read is there if Rodgers would let the design play out.