That method still results in the Dong when I re-enable the health option. Dunno if it does for everyone, but still.
There's an extended method, found also in that thread but I can't remember where exactly. Basically follow those directions to lower your health and the Dong stops, save your game, re-enable the option, then quit to the menu without autosaving (DON'T disable the trainer options you're using) then re-load your game. The option will still be active and no Dong.