No is the short answer, despite manufacturers claims it (probably) wouldn't have helped enough, if at all.
Under the tutelage and testing regime of Bigham his kit is going to be optimised to a miniscule degree. I suspect Bigham would amputate his own testicles if he thought it would save 2W.
Would Ganna have won if he'd had the monstrous Aerohead 2 helmet?