Is “The rise and fall of the Wagang Army and the fate of Li Mi” true?

The Old Book of Tang, Biography of Li Mi, records that Zhai Rang first gathered followers at Wagang, and later Li Mi replaced him, commanding hundreds of thousands of troops, shaking the realm for a time, but ultimately was defeated by Wang Shichong. In the romance, the Wagang generals are often called the 'Forty-six Friends' or greenwood heroes, but the official history records a large-scale, far-reaching peasant uprising and brutal warlord conflicts in the late Sui Dynasty.