Unfortunately mechanics like miss and glance don't count as something that can be effected by ability accuracy. I've gone over this myself with Kabam mods and forum guardians when Medusa's armor shatter didn't stop Darkhawks' miss mechanics from triggering. So no, Falcon's 100% defensive ability accuracy reduction will not effect miss. Which sucks, cause I think Falcon could really benefit from having anti-miss and anti-glance abilities.