All the options are there, you aren't missing any options.
So my question is how to do I use the point curve to invert an image. I am used to the tone curve looking like this.
Click one of the circles at the top, The white one for all the colors.
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Nothing has changed, only the interface did. The first icon at the top next to 'Adjust' is the parametric curve. The second icon (white circle) is the point curve. The three colored circles are the individual color channel point curves.