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, a yellow filter had to be used in front of the lens to prevent blues from becoming too light. So sensitization was rather poor.
A rock pile ceases to be a rock pile the moment a single man contemplates it, bearing within him the image of a cathedral.