Devlok Mini - Did Arjun attain moksha after listening to the Gita?

Devdutt Pattanaik talks about how there are theories about Arjun listening to Gita that have been brought forward by the Intellectuals.One of the theory states that Lord Krishna stopped the time to preach 18 Chapters of Gita to Arjun in the middle of the Mahabharata's Battle.