Pretty sure that's why he said around and not on? He wants it to absorb overshoot and to boost contrast by preventing reflections (people already do this with similar paint for the borders around their screens, I think some do like shag carpet or velvet curtains so they can adjust the aspect ratio, although the carpeting I think is also about sound absorption). Kinda curious about other aspects, like sound, radar, and thermal properties (does it get warmer due to absorbing the light wavelengths?).
Which, this might be interesting material to put on things like hoods for cameras or pro monitors. Maybe it could be used for telescopes. Heck, maybe it'd be good for putting around lidar sensors to prevent certain backscatter.
I feel like I remember them looking to do some hybrid solar/thermal things (where either they used heat to boost the solar panel, or they used the heat from the sunlight on the solar panels, and maybe this could help that, or help focus those mirror solar plants?).