That's not the case, it was most certainly panchromatic, save for some small deficiencies in the red.
In a way we are both correct. The plates released commercially in 1907 used a panchromatic emulsiom. However, earlier versions of the process used an "orthochromatic" emulsion. Just how far the sensitivity extended into the green region I don't know.
A rock pile ceases to be a rock pile the moment a single man contemplates it, bearing within him the image of a cathedral.