I learned that overexposure is a word to say when somebody does an exposure misinterpretation letting pass an excess of light. So an overexposure is a mistake.

Not if it is your intention, in that case u are controlling your camera and your exposure to be one with your vision.

In this technique that I guess it’s used for photographers around the world, but I cannot find if it has a specific name (it’s not ETTR) I intentionally increment the exposure so the sky for example is near white; I save the image in raw; open the file and recover the highlights.

If you wonder the difference between this and to process a photo with normal exposure is that I want to lighten the textures to a maximum, till almost they are just colors more than objects, as you can see in the photo of tonight.