This was a clever idea back in 1960 when NASA launched the Echo satellite.
Echo was more of a passive repeater experiment for radio communications, although it had the added effect of being bright and visible. I can remember my Dad pointing it out from our backyard in what was then somewhat bucolic and rural central NJ. This new one isn’t really adding any more artificial light to the skies, just reflecting what is already there. It’s not a light source itself.