Well, here's more of the card you referenced, and it seems to refute the belief further that the Traveler is the Gardener:
[spoiler][quote]"The Traveler moved across the iron world. It opened the earth and stitched shut the sky. It made life possible... [u]This is not the beginning but it is the reason.[/u]
The Ghost[rose] said, you are a dead thing made by a dead power in the shape of the dead. All you will ever do is kill.
The Traveler is life, I said. You are a creature of Darkness. You seek to deceive me.
But I looked behind me, down the long slope where the blossoms tumbled in the warm wind and the great trees wept sap like blood or wine, and I felt doubt." [/quote][/spoiler]
English
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yeah I just checked it, so the Traveler probably isn't the gardener of the black garden, but the way they put it here they say that the traveler Teraformed the planets in a gardener like way. Who this Gardener of the black garden is I have now Idea, but there's supposed to be a mission in the dlc where we go back to the garden hopefully this reveals more information.