Bhagavad Gita, Chapter 18, Verse 75

Through the grace of Vyâsa have I heard this supreme and most profound Yoga, direct from Krishna, the Lord of Yoga, Himself declaring it.

Sanjay names the real source of his own ability to witness this here, a gift, not a personal achievement.

Crediting Veda Vyas directly keeps this account honest about where the real access actually came from. Nothing about Sanjay's role is claimed as self-earned.