Tilak and the Aryan Origins: Are his findings still valid?

Lokamanya Tilak, the patriot, scholar, mathematician wrote his books a century ago. His stand on the origin of Aryans was that they once upon a time lived in the polar regions and then when living there became hard moved to other areas of the world and in its process to India, He based his scientific analysis on the data from Rig Veda. In this book Prof. M.M.Ninan analyses his basic scientific assumptions to see whether they have been changed or confirmed after a 100 years of scientific progress. What are their present day implications in the debate over Aryan Invasion?