KuKulzA beat me to it, but yeah that was the idea the quote was expressing.
As for the cavarly, this was always a problem in India, even until the time of the Palas who rather than import horses in large amounts made heavy use of the Kambojas.

Also as regards to chariotry, Indian chariots were very different from the chariots seen in other cultures, firstly because of their size (usually at least six feet tall and pulled by four armored horses) and relative maneuverability and secondly because of their use in warfare. Whereas chariotry west (and north) of India were used mainly to break up enemy formations, Indian chariotry evolved into a supporting role to their war elephants (basically the elephants crashed into the enemy, followed by chariots who would run down and pick off the ones who survived the elephants).

"Aryanization" really began in the Emperor Ashoka's reign and even then it was limited to peninsular India. The Gupta dynasty was largely responsible for the Aryanization of the entire subcontinent, but that happened around the 4th century.