I think it is the first time when notebookcheck.net has written about screen burning. It would deserve one article about it. This phenomenon is absent in TN. IPS suffers from this, according to me, touch displays are more susceptible (i noticed it in Lenovo Helix and Yoga). I also think, the burning occurs only at display edges (roughly 4cm wide)
You can test it yourself: let white-black checkerboard pattern displayed for some time (30s-4min is optimal for testing). Then display something different, for example solid color. It affects only darker mid-tones( I guess 25-50% black). You will notice, that the areas, where white was before, are now lighter. The effect disappears (according to me) in the same time that it takes it to "set" in, so 1-3 minutes.
I think that notebooks should be tested for this behavior also.