edit: an explainer as I can see how this sounds insensitive without context (note that I am not Japanese, this is only from what I have come to understand as an outsider looking in)
Japanese folklore, as Shinto, puts forth the idea that inanimate objects can have (or develop?) their own (personified) spirits. This has carried over to modern behaviour and beliefs, where personification of objects is quite common.
Even if most Japanese don't identify as being of Shinto faith/spirituality, and probably don't believe that random inanimate object X has a living spirit within it, items are often treated with great care as though they were to have a spirit. (theory time: maybe this plays a part in why you can often find used items in such good condition in Japan...)
I've noticed a lot of things that are considered autistic in the states specifically may be normal practice in various cultures, having worked with people in Germany, and from a large swath of Asia.
It interests me a bit, but I think the takeaway is that autism tends to manifest in a number of quirks, and the ones that don't align with the current culture the autistic person is in are the ones that are paid attention to. That and there tends to be a bit more obsession over said quirks than in those cultures, sometimes to the detriment of the autistic person or their social life.
Oh I agree there's probably no relation. Reading this I just found the overlap between autistic tendencies and Japanese cultural tendencies to be interesting, not indicative of anything else.