Not sure what's behind this decision, but the author did indicate before CET was hidden on NexusMods that this mod had moved to the point where he needed to start getting funding for the time and effort he was putting into it.
GitHub - maximegmd/CyberEngineTweaks: Cyberpunk 2077 tweaks, hacks and scripting framework
Cyberpunk 2077 tweaks, hacks and scripting framework - maximegmd/CyberEngineTweaks
github.com