First prepare the chocolate cake recipe according to that recipe post but bake the batter divided evenly amongst 3-7" greased & parchment lined cake pans
While the cakes are baking prepare the ganache recipe and reserve it at room temperature while you make the American Buttercream recipe
Once the buttercream is finished divide it up evenly amongst 2 bowls
In one bowl add the lactic acid for the shelf stable cream cheese icing
In the other bowl you will add the mocha paste which is simply hot water mixed with instant coffee granules and cocoa powder whisk to a paste, add this to the buttercream & mix smooth
Once the cake layers are cooled you can assemble the cake as shown in the video tutorial
Video
Notes
Death to Diets cake should be kept refrigerated but can stay out at room temperature for half a day. Refrigerate for 1 week wrapped loosely to prevent drying Freeze wrapped well for up to 1 month