It means creating three horizontal profiles to rough out the shape as a solid. Top. Bottom. Middle. Loft them. Now you can use this with snapping and a "through points" spline to draw rounded loops around the solid. Those loops are spline crossections along the model that you can use to loft a new solid. Because "through points" uses Bezier rounding, you don't get the initial flat shape but something more rounded and organic looking.
Here's the file. It seems I lost the middle spline somewhere but it was there originally to snap the loop spline points onto the profile splines.
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