Aha, this easily gets overlooked. It is the constructor for a 7.5" 3-color display that happens to have the same controller.
You seem to have a display with the 5.83 inch high resolution red e-paper display three colors, GDEW0583Z83 panel.
I don't have that panel nor that Waveshare display. Therefore it is not supported by GxEPD2.
I don't know, but I don't expect. Parameters may be wrong, but waveform and driving voltages are taken from OTP, so I don't expect ghosting (sort of burn-in) or lasting ghosting.