Most likely the picture was taken with a monochrome sensor with a filter applied tuned to a specific wavelength. That's more valuable than a color filter, which is made up of a mosaic of single pixel individual red, green and blue filters, interpolated to produce a RGB image.

I think it is a color photo, just it’s just everything I’m pretty much is grey I think. If you look closely in some parts there’s a tiny bit of color.

Yup. I just grabbed it and pinned the saturation, and you can see that the circular grills around the edge of the head are copper-colored.