There's a wrinkle hidden in there
There's a well-known technique for enhancing digital images in colour, which is to use a hi-res b/w overlay on a low-resolution colour image. The eye/brain sees the detailed intensity variation and maps the less-resolved colour variation to it. It plays on the way our eyes are constructed, with different sensors for intensity and colour.
I suspect this technique may also be using that trick so that there are actually far MORE panchromatic sensors than colour-filtered ones...