Agreed. This seems like just another instance of "slow light", which has been a thing since 1998 [1]. Speed of light in tailored materials has been as low as

Agreed. This seems like just another instance of "slow light", which has been a thing since 1998 [1]. Speed of light in tailored materials has been as low as zero. As in, stopped. And then restarted on command. [1] https://en.wikipedia.org/wiki/Slow_light https://en.wikipedia.org/wiki/Slow_light