Origin of Techno-Orientalism
The evolution of the term "techno-orientalism" traces back to the European colonial history of orientalism combined with the theory behind Western modernity.
European colonialism of Japan was interpreted in a way that separated the East and the West into two separate spheres. Westerners viewed the Western world as the norm and used it as a model to label the Eastern world, mainly Japan, as the radical other as if it intentionally developed itself in a way that was different from the West. This self-centered and narrow-minded interpretation led to what we know today as orientalism.
The Western world tried to differentiate itself from Japan and the East by proclaiming itself as more modern. However, David Morley and Kevin Robins argue that the Western construction of "modernity" acts as a limit on the extent to which the Western world can modernize. If the West already declared itself as modern, then it is incapable of creating its future-oriented and technological image of the future. This required the exportation of the futurological elements that shape future "modernity" to other host cultures like, most notably, Japan.

Orientalism Refined in a different way

Edward Said

Why Japan?
The ease with which Japan was able to adapt to the technological elements which the West viewed through the techno-orientalist lens was largely due to Japan's history with self-orientalism. The influence of images of Western orientalism has largely been accepted by many Japanese, turning their polarization from negative to positive. So while the West viewed Japan with a warped techno-orientalist lens that labeled the overly technological and robotic characteristics as radical and weird, the Japanese have adopted those "radical" and "weird" features as their own; instead of viewing themselves through a techno-orientalist lens, the Japanese view them as their cultural norm. As such, it is no coincidence that Japanese industries often export products that have techno-orientalist avatars.