It is a quite common name. I can't say for certain as I didn't ask for pictures from his daughter therefore never seen Hideki. I can try and contact her again to see if she would send some over. She did say her family received his pension from the company even though he went missing. She seemed to think they didn't terminate his contract.
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You mention "There were three Junji Ito pinball machines made. Well four but we will get to that.", but I read carefully, and maybe I missed something, but there is no further mention of a fourth machine. Is it possible to develop this part ?
edit : oh maybe you are talking about " the re-skinned cabinet from another game with Ito style graphics to show the executives his vision."