Destiny 2 Lore - The Secret of the Black Garden! What was this doing in Taranis's Lair?

Destiny 2's Lore and Story in the Season of the Wish has hit a strange point. We've completed the last of the interactions with the Wish Keeper Exotic Bow's quest. This has led us to a secret in the heart of Taranis's lair. An Ishtar Collective Logo made of Vex parts. Why was this found in the Black Garden? What is its significance? Today I dive into it and try to find out.
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