There isn't a word like lebensraum in Hindi as far as I know. Zameen can mean plot of land so it could work but since we haven't had a settler streak yet since independence a concept like lebensraum has not materialised yet. This Twitter user is an outlier even within the spectrum of deranged Hindu fascists. That's not to say that racism against Africans is not common but people don't talk about randomly invading a continent that is thousands of miles away.
No, it wasn't the Persians, as "Persian" wasn't even a thing during Proto-Indo-European times. It's similar to calling them "Russians" or "Germans" or "Swedes"
Aryan is a loaded term to the westerners. It's like saying Swastika is a loaded thing in the West. In the east millions of hindus/buddhists use swastika as a symbol of devotion to god/karmic cycle for 3000 years. Our marxists journals and marxist historians always write about aryan migration and etc. They themselves wrote in the ancient sanskrit that Northern India is Aryavarta , why should I change my history for a man living in other side of the world genociding jews.