Contextually, the statement was made to emphasize Raikage's speed. By comparing Raikage's natural reflexes to Minato's, Kishimoto established that Raikage had incredible reaction speed. However, by revealing that Raikage can actually augment his reflexes, he then proves that Raikage's reaction speed is actually legendary because it surpasses even Minato's. The entire purpose of the scene was to highlight Raikage's speed and by mentioning Raikage's natural reflexes, he managed to accomplish that goal rather effectively.
The timing of that statement literally has no bearing on what Cee was referring to when the contrast between "I'm surprised that Jugo, Suigetsu, and Sasuke can keep up with them" (Base Raikage) to "Still, with his accelerated reflexes, not even the Sharingan will keep up him" (V1 Raikage) to "What's more ..." (V2 Raikage) implies that Cee was referring to different stages of Raikage's reaction speed. He started by highlighting Base Raikage's reaction speed, then transitioned towards V1 Raikage, and then transitioned towards V2 Raikage in a subtle manner.