Could this mean that Sitchin was right?
Uh, no.
In his very first book, "The Twelfth Planet", Sitchin claims that a planet Nibiru is in a 3600 year orbit around the Earth. One contemporary reviewer pointed out that Sitchin apparently sync'ed this such that the most recent pass of the planet was in the late centuries B.C., an event for which there is no testimony. The reviewer also pointed out that the supposed information from the aliens regarding the extent of the orbit was incompatible with Kepler's laws.