there has been no official announcement or credible scientific evidence suggesting that the James Webb Space Telescope (JWST) or any other telescope has detected artificial light on Proxima b.
Proxima b is an exoplanet orbiting the star Proxima Centauri, which is the closest known star to our solar system. It has been the subject of scientific interest due to its proximity and its location within the star's habitable zone. However, directly observing the characteristics of exoplanets, including their atmospheres and signs of artificial light, is a complex task that requires advanced observational techniques.
The James Webb Space Telescope, which is scheduled to be launched in December 2021, is expected to provide valuable data about exoplanets and help scientists in their quest to study their atmospheres and potential signs of life. While the telescope's advanced capabilities may allow for detailed observations, any claims about the detection of artificial light on Proxima b or any other exoplanet would require rigorous scientific analysis, verification, and peer review.
It's always important to rely on official announcements and scientific publications for accurate and reliable information regarding astronomical discoveries. If there have been any significant developments since I'm not interested in that topic as much as i used to and my answer might be a bit outdated, I would not be aware of them. I recommend consulting up-to-date sources or scientific news outlets for the latest information on the James Webb Space Telescope and its observations.