Anybody can see the pseudo-reasoning here, called begging the question. The hidden presumption that Vyasa actually claimed that Vaisnavism is only for Indians.
Of course there is no sastric support for that. A vedic axiom is that we are not the body. Why would God limit himself to a race of men? Is he tricked by his own Maya?
Idiocy is to practice dharma on the bodily platform - the practice the Vedic principles as though they only benefited those of a particular race of men, in a particular kind of body.
Since Vedas is spiritual knowledge, it is not only idiocy, it is a contradiction in terms.