So I sat through it. How many ways is he wrong?
For all his struggles with the SolidWorks interface all he produced was a corrugated airfoil, not tubercles.
Once he has the two airfoils he could have pasted one three times and then pasted the other three times. When he closed the curve he should have joined the two arcs.
I don't like the UI  that snap line that follows you back to the menu.
What would I do? I'd find an SVG of the airfoil, Import into Blender, Extrude {x8), Subdivide, and select the front half of the airfoil. Then apply a Wave modifier. That would keep the back half of the airfoil correct. Five steps to real tubercles.
edit:
I looked at the Wave modifier. It is wild and unruly beast. But I see that Blender has NURBS as well as Bezier curves. That might be the best approach.
Quote:
https://www.makeuseof.com › nurbscurves3dmodelingblendertutorial
How to Use NURBS Curves in 3D Modeling: A Blender Tutorial  MUO
Jan 29, 2022How to Convert NURBS to Mesh in Blender. In order to create concrete geometry out of separate NURBS curves, we'll first need to finalize the shape and convert it into a mesh. This method will work for any type of NURBS object in Blender. To convert NURBS to polygons in Object Mode,
