The documentation doesn’t modify the ROM. To play Sacred Gold / Storm Silver, you still need:
The download package includes xDelta GUI , which is the required application for applying the patch to your ROM.
Select the file from the "Patches" folder. You can usually choose between the Complete (full changes) or Classic (gameplay changes without stat/type edits) versions.
: Includes all gameplay and Pokémon modifications (stats, types, and movepools). Classic Version