If you get the reflex skin only if you buy a graphics card so (1060, 1070, 1070ti) or you can get synonymous if one of the graphics cards in Pc "finished inside"
If it helps, I have linked the PC here: https://www.amazon.de/...07B3T3FDG/
(The gtx 1060 6gb Rev.B variant)
You only get the skin if you order a graphics card on the NVIDIA Sete. You will then receive an email with the code for the Skin Bundle and can redeem it on the EpicGames page
Just buy the counterattack bundle for 30 euro on Kinguin.