Basically that is correct but more than likely the outside stringer is studded up under, so that stringer would need to be moved inside the newly framed wall with a 2X4 spacer nailed flush with the bottom edge of the stringer for sheet rock and a skirt board to slide down between the stringer and the wall, so the stairs would need to be disassembled.
R311.7.5 Landings for stairways. There shall be a floor or landing at the top and bottom of each stairway. A flight of stairs shall not have a vertical rise larger than 12 feet (3658 mm) between floor levels or landings. The width of each landing shall not be less than the width of the stairway served. Every landing shall have a minimum dimension of 36 inches (914 mm) measured in the direction of travel.
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