It's hard to read between the aggrandized lines, but it appears that this is a discrete phenomenon based on precisely switched gates/reflectors. It's super interesting but not exactly science fiction.
Imagine your signal looks like _A_B_C_ where each letter represents a discrete subpacket. The reflectors look like _1_2_3_. As long as those gates are timed to turn on precisely between the subpackets, the reflected signal would be the reverse order of packets.
We could already make light "slow", and then we can move our eyeballs faster than the light, hitting photons in the reverse of the order they were emitted in. It certainly isn't "time reversed light", it's a time reversed signal. I didn't RTFA though.