Genji's other arm is not robot. It's organic then (read the text above him) also you can see his fingers are revealed which means that it's just an armor (yes it says
Overwatch's Genji Crosses Over To Blizzard's Heroes of the Storm
Genji - Overwatch Guide - IGN
Kahotan's Blog | GOOD SMILE COMPANY Figure Reviews | figma Genji (OVERWATCH)
Ship this, Overwatch fans: Genji's got a working wang | PCGamesN