Non-Binary = Non-Human - A Trope of Representation

Discussing a common negative trope in non-binary representation and how Netflix's Dead End: Paranormal Park combated it

Courtney (Bottom Left) in Dead End: Paranormal Park is not non-binary, but she is the best representation on this list

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Futurama, Good Omens, The Good Place, Loki, Solar Opposites; these are just some examples of shows that feature non-human characters who are defined on the non-binary spectrum. However, this creates a few issues. Firstly, does this imply to be defined as non-binary is to not be human? And secondly, why does a character have to be non-human for writers to add representation?