Whatever happened to the experiment to try to determine whether the speed of light is decreasing, rather than constant? [0] I can't seem to find any results on

Whatever happened to the experiment to try to determine whether the speed of light is decreasing, rather than constant? [0] I can't seem to find any results on that. [0] https://motherboard.vice.com/en_us/article/8q87gk/light-speed-slowed https://motherboard.vice.com/en_us/article/8q87gk/light-spee...