This is a Godot addon that adds Lua API support via GDScript, C# or GDExtension. Importantly this is NOT meant to be a replacement for or alternative to GDScript. This addon provides no functionality to program your game out of the box. This addon allows you to create custom Modding API's in a sandboxed environment. You have control of what people can and can not do within that sandbox.
Why do you think that https://github.com/godotengine/godot-proposals is a good alternative to godot_luaAPI