I have not tested this outside of comparing the gcode between SuperSlicer and Cura. Values were within 1mm of of each corresponding value.
I don't know python and have no interest in learning it, hopefully someone can clean this up.
START_PRINT BED_TEMP={material_bed_temperature_layer_0} EXTRUDER_TEMP={material_print_temperature_layer_0} AREA_START_X=%MINX% AREA_START_Y=%MINY% AREA_END_X=%MAXX% AREA_END_Y=%MAXY%
I just tested it with 5.1 after using it with 5.0 since its release and there are no issues on my end.