There is NO official Noclip mode. RobTop Games (the developer) has never and will never include a built-in Noclip cheat. Any APK offering this is a modified clone of the original game.
Level creators often use Noclip to record "preview videos" of their new, extremely hard levels without spending 10 hours verifying the run legitimately. Geometry Dash 2.2 Apk Noclip Android