I was confusing points using the Earth and Moon and those using the Sun and Earth. You are right in a given system the points draw an equilateral triangle. But

I was confusing points using the Earth and Moon and those using the Sun and Earth. You are right in a given system the points draw an equilateral triangle. But JWST orbits the Sun Earth L2 point, so the moon is not directly involved. Of course it influences, but it’s different than the Earth Moon L2.