Instead of using a post-processing script, you can simply make these changes to your Orca settings instead:
Add to bottom of Machine Start G-code:
SET_PRINT_STATS_INFO TOTAL_LAYER=[total_layer_count]
Add to Layer Change G-code:
SET_PRINT_STATS_INFO CURRENT_LAYER={layer_num + 1}
Post-processing script for OrcaSlicer to make layer numbers work on the Elegoo Centauri Carbon
Download the latest release and add the path to it in Post-processing Scripts in OrcaSlicer.
The script overwrites the start of the second line (normally "generated by OrcaSlicer") with "generated by ElegooSlicer".