In that case, yes, I'd agree. According to the tonal reproductions, the original negative would have been panchromatic film, so the yellow has been reproduced as expected, if slightly light - but that's either due to the exposure of the original film, the printing of the original Bromide print, or contrast shift in reproduction. With this 'standard' B&W film/paper, a pink disc would have appeared as a slightly lighter tone compared to the black of the blade, whereas here, it's too bold to be pink.