There is a prevailing notion that Vedas are Eternal (Anadi), Uncreated (Apaurusheya) and Universal (Akhila).
Eternal - always/omniscient - past, present and future. Meaning, it cannot refer to things only at a particular time in history.
Uncreated - not composed - by human, animal or deity. Meaning, it cannot refer to things that were created at some point.
Universal - everywhere/omnipresent - India, Earth, Mars or Andromeda. Meaning, it cannot refer to things only at a particular place in universe.
It also means that Vedas must be able to be understood by every being.
Let me illustrate the above with examples.
If a book is written only in বাংলা, we say it is localized to Bengal, not universal place.
If a book talks about Indian independence in 1947, we say it is localized to Indian history, not eternal time.
If Newton's gravity equation F = Gm1m2/R^2, is written using Latin alphabet, we say it was composed by a human because Latin was created sometime in past 5000 years, and we can say it is localized to 1.seeing 2.humans, because blind humans, and dogs, cannot understand Latin.
But if a book contains all languages, and references all events, in all places, at all times, we can say it is universal and eternal and uncreated.
Similarly, the Vedas only contain references to North Indian geography, and not Mayan architecture. They talk about Dasharjana (battle of 10 kings) but not Pokhran nuclear blasts in 1971, or what I will have for lunch 1000 years from now on a Purnima Somvaar. Vedas talk about Brahma, but not Mr. Ramesh Babu my neighbor next door. Vedas are in Sanskrit, not German, and last I checked, lizards didn't understand Sanskrit. Also even I cannot understand Sanskrit when I'm sleeping, cos there is an inherent condition that I must be awake.
Thus, the Vedas are neither Eternal (they don't refer to Somnath mandir which was rebuilt AFTER Vedic period), nor Universal (they don't refer to Mars rover and they don't contain woof woof meow meow sounds), nor Uncreated (they refer to created beings like Brahma or Agni or Indra, who were not present before creation).
How do Shastras give rebuttal to this?