Is this what you are saying?:
Yes, but it's only part of it. The simplified diagram shows tele-centric focused light, and the micro-lens helps to concentrate the light on the photosensitive areas instead of the supporting structures. When the chief ray angle is oblique, then the angle is changed more in the perpendicular direction as well.
In practice, there can also be a sort of aperture mask (perhaps simplified by just the 'walls' in the diagram) near the top of the sensel structure, which will cast a 'shadow' when light enters at an angle, and the micro-lens will reduce that by reducing the angle of light to become more perpendicular. More importantly, when the micro-lens is not centered above the sensel but rather somewhat offset in the direction of the center of the sensor array, it can be even more effective when the refractive index is closely matched to the amount of offset.
Possibly irrelevant to this discussion:
Plenoptic optics are indeed something different altogether.