Final answer:
The statement is false; Kepler's laws of planetary motion do not require complete isolation of a planet-satellite system from other massive objects, but they assume a two-body system for simplicity and provide a good approximation despite other influences.
Step-by-step explanation:
The statement you've asked about is false. Kepler's laws of planetary motion do not require a planet-satellite system to be completely isolated from other massive objects. However, Kepler's laws assume that the two bodies are in an isolated two-body system for simplicity. In reality, the presence of other massive objects, like other planets and stars, can cause perturbations. These perturbations can result in slight deviations from the perfect elliptical orbits and other aspects described by Kepler's laws. Nonetheless, Kepler's laws provide a good approximation for the motion of planets and satellites as long as the gravitational influence of the second body (the planet or the satellite) is significantly stronger than that of other nearby objects.