90% of the things that Japan introduced according to comment sections on the internet never happened (or never made it past the prototype stage) and the rest was actually introduced in Korea, not in Japan.
The Japanophilia is strong with a lot of people on the internet.
I once had a company give me an assignment that sounded very much like what you are describing. They said I should allocate 10h at once to implement a real-life task that they had and that their developers "already solved".
At that point I only wrote a handful messages with their recruiter and hadn't even spoken to a human there. I didn't even know anything about the team, my potential boss or the project at that time.
I didn't even answer back, just ghosted them. I'm not going to spend multiple hundreds of Euros of my time just for some assignent to maybe qualify for an interview.