Every football game there are players hit in the chest during similar intervals. Football players also wear pads.
Commotio Cordis usually happens in baseball.
If this indeed was Commotio Cordis, it is possible he has an underlying condition. For example, if he has myocarditis (heart inflammation) due to an infection, this would significantly increase his chances of a cardiac arrest during the contact.
Correlation is not causation. It is possible the hit may of had nothing to do with the cardiac arrest. Many young athletes die every year due to some undiagnosed heart condition.
It should also be pointed out Chris Pronger who was hit in the chest by a puck in 1998 was unconscious for only 20 seconds. If you watch the full video he is conscious, talking, and moving when leaving the ice rink.