No they won't reset autoloads, only the current scene, you would have to do that manually. Also yes I wouldn't recommend using autoloads for this, personally I would use something called "Resources" which are perfect for modular upgrade systems, a good tutorial on how to implement them in this way can be found here on YouTube. It might be a little hard to completely revamp that system using a more complex method so worst case scenario some spaghetti code can help you by just saving all the default values in the autoload and resetting them through a function in the autoload to be called in your death function before reloading the scene. Again this is bad practice but hey whatever gets the game made!