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Sigma's MP claims are a bit convoluted because the Foveon image sensor has 3 layers of pixels.
But because of the way the Foveon image sensor works, many of the pixels don't get used.
The top layer can 'see' all three RGB colors. The middle layer can't 'see' blue light, because all the blue light is absorbed by the top layer.
the middle layer 'sees' green and red light.
The bottom layer can only 'see' red light, because the top and middle layers absorb all the blue and green light.
But because of the way the Foveon image sensor works, many of the pixels don't get used.
The top layer can 'see' all three RGB colors. The middle layer can't 'see' blue light, because all the blue light is absorbed by the top layer.
the middle layer 'sees' green and red light.
The bottom layer can only 'see' red light, because the top and middle layers absorb all the blue and green light.