The key thing being that they won't need a new transport erector so it will be rolled out to the pad vertically (but they can't construct it vertically due to the lack of a suitable building to do that - they don't have Mega Bays (or Giga Bays) like SpaceX.
*"we had already been working for some time on eliminating our transporter-erector in favor of an alternative vertical conop, and we’ll now go directly to that; so we don’t need a new transporter-erector."*