Nails were counted already; the hardware that sits beside them was not. wall-framing-takeoff now takes fasteners.holdDowns: {wallEnds, openingMinWidth, price} in the plan: one piece at each end of every wall, and/or one on each side of every opening at least that wide. On the example house at 60 in that is 16 at wall ends and 4 beside openings, 20 pieces, and a "Hold-downs" line in the budget.
It only multiplies a rule you type. Which walls and openings need hold-downs, and which model, is the engineer's call, and the count is checked by hand on made-up walls, not against a real plan. Not engineering advice.