No, I don't see it anywhere in my menu for skins. Maybe it's added through some DLC ? I don't know, the only skins page with 3 skins only has a skin called Bullseye as the last option in Ion's case. I don't mind though, my Ion looks dope with the Dark Legion skin.
From the screenshot, yeah, I would say that your shield picked up Reaper rockets Triple kill with them must have felt so satisfying !