Tawny, a self identifying non-male means someone who is biologically female, but it excludes all those females who identify as men or non-binary.
or
a biological male who identifies as either a woman or non-binary.
So it is a grouping of mostly females but includes some males who claim to be women or non-binary some or all of the time.
The females not in the above group are in the self identifying non-female group. Because they identify as men or as non-binary.
In attempting to smash the binary, the Greens have come up with a binary system. Based on criteria that they are unable to define. They have no definitions for male or female so their system is based on self identifying as the opposite of the thing that they can't define.