Biological sex != gender. There’s not even 2 classes of biological sex. There are men born with biological female organs and women born with biologically men’s organs. We all as humans do share common organs, one of which happens to be the nipple.
Regardless of what your actual biological sex is a gender is simply a social construct used to identify someone. A person who is “non-binary” feels that their gender does not conform to what you would typically expect of either male or female based on appearances or behavior.
The article mentions this is aimed at enterprises who are already probably doing something like this with vmware ESXi