Earlier quoted context omitted.
Honestly, even those in the link are impressive to me. Just think of where technology was at that point in time, and what ingenuity it took to create pictures of this quality.
I wouldn't call it "technology". It's more of a successful experiment than technology, to me. Color separation cameras came two decades after, and this was really a technology : making one camera capture at the same time 3 pictures on negative. (Where those very impressive pictures shown in the link are taken using the color separation process but without a color separation camera, and not on negative.)
Experiments are a kind of technology by any common definition. Just because this never rolled out into mass production doesn't mean that it wasn't a systematic application of scientific/engineering principles.