[jaywalk]

You're correct. The numbers that are promoted for just about any camera out there refer to the actual size of the output, not the number of elements in the sensor. I'm not sure where the parent comment was getting his info from.

[karamanolev]

The actual size of the output is not the actual size of the sensor. The color data is interpolated. The promoted size is the output size, but that's not really full subpixel resolution in the monitor sense.

The promoted size is the number of photosites on the sensor, but each photosite is grayscale. Look at any RAW camera format or the datasheet of a sensor (e.g. one of popular Sony sensors). All of that applies to Bayer sensor and not Foveon, but Foveon is not particularly popular by any measure.