Yes, really.
You won the key, marked it as Received, you don't have the game on your account, so 100% you are regifting the game
https://www.steamgifts.com/about/guidelines

Gifts you win must be activated on the Steam account you used to register. Do not regift, trade, or sell the gifts. After activating a gift on your Steam account, do not remove the game or set it to private, as we may need to verify the activation if your account is reviewed in the future.

Upd after your edit:
You have to read Winning section, but not Creating :)