Sources agree that composite-bow horse archery, the feigned retreat, and rapid cavalry maneuver were practiced on the Eurasian steppe for centuries before Genghis Khan, and that his own contribution was organizational: converting scattered tribal practice into a disciplined force under central command, applied at empire-conquering scale from 1206-1207 onward. How much of the credit for the tactical system itself belongs to his personal command genius versus the inherited tradition he drew on is not settled the same way by every account; some popular treatments still present the tactics as his own invention.
What would resolve this A comparative study of pre-Mongol steppe army organization (Xiongnu, Rouran, and early Turkic khaganate practice) set directly against the Mongol decimal military system, to separate genuine Mongol-era organizational innovation from continuity with earlier steppe warfare.
Openmilitary history, steppe nomad archaeologyWikipedia: Mongol military tactics and organization