I don't think it actually is. When you look at the same ship on Balmorra, its the same size as whats on Taris, so to me, it looks the devs made the whole ship as part of the Tarisian landscape.
I agree with the original point made. The Endar Spire exploded, and explosions don't usually leave whole sections of ships in tact, not to mention re-entry and crashing through layers of the city above before reaching the bottom. Would kinda leave it a little damaged
Its a small thing and not something I would worry about. Just a small oversight.