Not his Base Rasengan, but with KCM2 or SM possibly. The golden armor doesn't cover his head, so even if he can't breach his armor which the profile states as its durability is Island level+, he can still damage his body. Alternatively Minato can teleport his Avatar behind Gil and just slam him with a Massive Rasengan.
Also I realized that actually since this is KCM2 Minato, his reaction speed wouldn't be 22.3x greater, as his reactions only outdo his combat/movement speed by that much in Base/SM. Ironically Alive Minato is better for speed equalized matches than KCM2 Minato. Although KCM2 Minato still = Juubidara level reactions+KCM2 level reactions compared to his just KCM2 level combat speed, so his reactions would likely be roughly twice as fast as his opponents' (although the profile technically says he's comparable to KCM2 Naruto despite his Base having faster reactions than that...).