It is clear that what the mobile lab sits on is not a lander. The lab itself is a cylindrical structure with four wheels. There is nothing else. A lander must have fuel tanks and retro-rocket nozzles for deceleration and hovering and many small nozzles for position control/keeping, yaw, pitch/roll controls. A lander/rover combo just don't look the way it is shown in the slide.Maybe the lander and the rover are combined together. The whole rover lands on the moon and can travel on it's own.