No, not the red "X". Red "X" just means you have cut through that layer of the tree. It does not mean good or bad.
I'll repeat: image #4 and image #6 are illustrations of what you DON'T want to do. Image #7 is what you DO want to do.
I'm not sure why you are posting these images? They say the exact same thing that I've already posted, except they do it in a foreign language(?) I'm not trying to be rude but I don't understand why repeat the exact same content but in a way that can be misunderstood(?)
Let me explain the French
Image 4 shows what happens if you don't cut your girdle deep enough, and don't sever the phloem, which doesn't allow auxin to accumulate above the girdle (bad).
Image 6 shows what happens if you cut your girdle too deeply, and sever the sapwood, thereby severing the flow of water and nutrients to the top of the tree/top of the layer. You have basically creating a large cutting (bad).
Image 7 shows when you cut your girdle to the correct level, severing the phloem but not severing the sapwood. This allows auxins to accumulate above the girdle while still supplying the upper portion of the tree with water and nutrients (good).