Old thread, but having read the article it seems to me that it's possible that it was an order to not photograph them. But alternately, given the close quarters combat nature and use of these guns, it seems also quite likely no photographers were "in the mix taking pictures" of these guns in use. I've never seen photos of bayonets actually being used (fixed, yes, but not in use), but we know those were used.
We have some video and images of men running across fields, for instance, but these are almost always from afar safe distances. But when it's really dangerous, as we hear of entire battalions mowed down; I don't really recall seeing videos of that. But we know it happened.
Likewise, trenches were of course narrow long pits and if infiltrated, it was life and death, every man scrambling with a gun or bayonet for survival. Probably not many selfies being taken ... And that's my opinion.