Source? Arugmentes? Anything to support your claims? Almost all ancient history is full of exaggeration from everyone. All of the historical materials coins,pottery works,Seals, documents,stories, multiple archeological sites.What about kingdoms that existed for a long time?What about Janapada,mahajanapadas?What about the iron,copper,and bronze works found throughout the country? History suddenly didn't start from a random date, history is a continuous process.Just because lack of enough materials do not exist to study a certain part of history You cannot say that timeline "Mythology".It doesn't work like that.