They simply removed the DVD check. In the legal version, if you tried to fly into Japan without having DVD #6 in the drive, X-Plane would dump you into the ocean. CODEX patched the scenery loading routine to say, "All tiles are valid. Let the man land in Tokyo."
Unlike the main game, the scenery requires no crack. You simply check a box that says "Copy contents of CODEX directory to installdir" — but for the scenery DLC, this just copies a .dsf index file. X Plane 11 Global Scenery DLC-CODEX
X-Plane 11 Global Scenery DLC-CODEX is a comprehensive, community-repacked collection of the entire world's terrain, textures, and autogen data for the X-Plane 11 They simply removed the DVD check
Adding the full global scenery significantly increases the game's footprint: Updating Scenery in X-Plane 11 Let the man land in Tokyo
If you are using a version associated with the release group, the "text" you are likely looking for refers to the installation instructions or the contents of the .nfo file. Installation Overview
