Oh definitely not, the bosses are the one thing that should never be using the old tileset period. All I meant was that since the Sergeant formerly known as Nef Anyo should probably be on Venus, the Jackal would need to be on Phobos, and that would require keeping his arena unique from the rest of phobos (sort of like how earth uses both a forest and a sea-lab adjacent tileset).
However, something I wanted to also add that I had completely forgotten to consider; the old corpus ship tileset could also just be used for Railjack missions instead (ones like the spy mission from call of the tempestarii for instance). In that case, it would even make some of the more annoying features like the breakable glass more useful, as it could possibly be used as a way to get off the ship and back to your own faster.