The satellite captured a Pakistani Navy hovercraft approaching Manora beach. This is a convenient location, right next to a a major Marines base known as PNS Qasim. From other sources we know that the hovercraft was carrying both Pakistani and Chinese marines. The troops ran down the ramp and across the beach side by side, a formation designed for the cameras. In combat conditions the troops would probably not be deployed in this manner.
The joint exercise was not just for the cameras however. It underscores the close defense relationship which extends into industry. China is a major arms supplier to Pakistan, and has been helping better establish local shipbuilding. The exercise in question, Sea Guardian 2020, took place in January.