The larger plan doesn't show how the buses and coaches will exit the coach station.
Think it is safe to say it will remain as it is now.
As I have said above, classic Short Term commercial thinking, of the kind that we see in the UK every day.
Probably a consequence of the short remaining lease of the concession. Why spend extra money on a long term solution when some other company might get the benefit for free. I have no doubt this was the thinking why the new taxiway extensions don't go to the end of the runway as they are not needed now.