If you look closely, those fans are facing with the airflow up and out. You can tell by seeing the crossbars that connect the fan motor to the housing which is usually on the outlet side.
So those are probably second fans with the factory default fans on the bottom. They are situated the "right way".
Ya I was about to say they could have just flipped the fans
Fans are much less effective in suck position. You would have to make the tunnel over the heatsinks air tight.