The name is real, but it appears in neither Bungie's documentation nor the developer's own. Here is where Project Sunrise came from and what it actually covers.

Bungie told a federal court it couldn't run the Red War campaign anymore. Two months after Destiny 2's final update, a solo modder got pre-vault builds loading with community tooling. Here's the full list of what Year 4 removed, what the exploration tool can and can't do, and the two claims the developer has since corrected.