It is already a well documented fact that the Aryans who settled India and developed the Hindu civilization there originally arrived from Central Asia. Perhaps this shows that these same people may have migrated from Central Asia toward the north, bringing already formed Hindu ideas with them. Perhaps this also shows that Hinduism is older than originally speculated and did not have its oldest roots in the Indus Valley, as also widely believed. Very interesting information indeed...
Hinduism is older than 8th to 10th century AD. By this time, the Muslims were almost at our door-step in Afghanistan. I'm not sure whether the above evidence proves a hypothesis of a Central Asian origin although I do believe in the Aryan migration theory. One statue doesn't prove much, it could be an aberration.