A plain reading of the article would indicate to me that the police requested that they exit the vehicle and cuffed the adults as they stood on the side of the road, while they investigated the suspected stolen vehicle.
For a suspected stolen vehicle on a military base, I would consider that restrained.
If it had been a single young male driving the vehicle, I would not be surprised to see the driver forcefully pulled from the vehicle and cuffed behind the back as he lies face down in the ditch.
And that includes pointing guns at children?