I disagree.
Surely, it will help with optical systems, but blackness is not a primary problem. The bigger problems are with the sensitivity of sensors and internal heat. The biggest advances can still be made by increasing sensor/cell sensitivity, by lowering signal-to-noise ratios of electronics and by cooling interiors to reduce infra-red emissions. Earth-bound optical systems then have the additional problem of light coming from the surrounding atmosphere as well as atmospheric refractions. While in space do you have the problem of much larger heat built-ups plus you need to shield against the sun's thermal and electromagnetic radiation. The need for blackness inside optical systems is a peripheral problem. The new material will certainly not lead to a 28-fold improvement in imagining. Such a claim is ludicrous.
With thermal solar power plants does it have many areas (main areas as well as peripheral areas) where small improvements lead to an overall improvement. However, the new material can be used in the centre of the energy conversion where its properties will have a direct impact. Its extreme blackness and its thermal conductivity will both take a direct impact on a plant's efficiency. These plants require large surface areas and a lot of direct sunlight to be feasible, but with no foreseeable end to our energy demand, will even the smallest improvements find their way into the next generations even when it means it takes a redesign of the plants.
Speaking of redesigns, if you take a look at the next generation of space telescopes like the upcoming James Web space telescope, which has a unique design, will you see that its main advances come from its shielding and positioning in space. This will provide its optical system with more blackness and less heat, because instead of only wrapping the telescope into more and more layers did they simply reduce the need for layers, which is a major break from all the existing designs currently in orbit.
So I stand by my statement that the new material will have its uses on "insides" as well as "outsides". The new material, while currently being complicated to produce, is simple enough and it only depends on what you make of it.