There is a point that in the 80s much electronic tech came from Japan and that both Ono-Sendai and Hosaka are named as top of the line cyberdeck manufacturerers, but that is pretty much it, they have no relevant part in the story. I think people are trying to forcefully over-fit that 80s japan craze they read about in an attempt to seem like sophisticated literary critics. Maybe i can't see it because i am not american and my national pride isn't being triggered by jokes like "Mitsubishi Bank of America" and by the idea that globalism may not mean hegemony of the USA. Major roles in Neuromancer are given to companies like Sense/Net, Maas Biolabs, Tessier-Ashpool and the Eastern Seaboard Fission Authority, yet people cling to side notes about hardware brands because they are offended with the first chapter playing a Chiba City Blues instead of some New York City Jazz.