It is true that the Vishnu Purana does mention the Kliakila Yavanas in Chapter XXIV (Book 4), albeit as a prophesy, not an historical account. However, K. R. Subramanian posits the Kilakila invasion of Andhara to be as early as 225 A.D./C.E., over 200 years earlier than Vaidya. Regardless, even if Vaidya does not accept the prophetic nature of this material in the Vishnu Purana, he does not account for the possibility this information could simply have been added to an existing Purana (i.e. rather than being composed from scratch during or after this point). Consequently, Vaidya's claim about the date of origin of the Vishnu Purana is speculative in nature and without evidence.