My understanding is: The author is a VHS electronics enthusiast and had published photos of unmarked VHS cassettes [1]. Some designer photoshopped them to add the "Stranger Things" graphics and Netflix used the photoshopped images without attribution. Author's photographs are literally the first hits in a google search for "VHS cassette". Author did not create a VHS version of the TV program.
[1]: http://goughlui.com/the-vhs-corner/intro-inside-the-vhs-cass...