The composers of the Puranas are either accomplished yogis or seekers of Truth. The Knowledge and spiritual realisations obtained by their sadhana remain recorded in the respective Puranas. The Vedas and the Upanishads are the fundamental scriptures of the Hindu religion, the Puranas are commentaries on these scriptures.
The second reason adduced, viz., that Aryabhata should have hailed from Kerala is fragile. Besides the Aryabhatan system being prevalent in this land,-“all” commentaries on Aryabha?ya have been produced by Kerala astronomers really does not stand scrutiny.