How to prevent or cut extra points made during lofting

Hi, I want to set supports at the edges of a shell element made of mesh. The mesh was made through lofting curves. When lofting, a series of points are created at the edges/endpoint of the curve as seen below. How could I remove those points?

I have tried to remove those point through deconstructing the points, and if y=0, then cull the list. However, it didn’t work.

Appreciate any advice.

Can you post a gh file with internalized geometry?