It's important to note that none of these things are necessarily done deliberately (though "white supremacy" is perhaps a bad way to express "racism that benefits white people specifically"). Other than transphobia, either the linked article, or the letter linked in that article provide evidence for all of the accusations. Facial recognition software that doesn't handle dark skin well intrinsically treats different ethnicities differently, in this case disadvantaging non-white people. Many of the markers for "suspicious behaviour" that are used to detect cheating are also present in people with both mental and physical health conditions. Dealing poorly with headware has an outsized influence for non-white women (who are likeliest to wear headwear that obstructs the face).

Again, I wouldn't chalk any of this up to deliberate bias against any of these groups, but it's all bias anonetheless.