Nobody is going to use it against you, but a state actor could use it against a specific target like a politician or military to develop a more accurate assessment of information they already have been collecting.

I read the whole article and I think even that is a ludicrous stretch. In order to get a vague image of your hand it requires either several minutes of projecting a precise black and white bright checkered pattern on the screen, or over an hour of subtly embedding varied brightness in a video. The checkered pattern represents a best/worst case scenario for this kind of attack, and even that is completely impractical for anything in the real world. This is literally zero risk for everybody. Forever.