i can tell you with almost 100% certainty this is a joke.
not only does the technology not really exist to compact a camera down to the size of a bullet, and affix it with a power supply, and a transmitter, and make it robust enough to survive the force of being shot.....for $100.
that bullet is going to be spinning at several thousand RPM.......that image would be a constant blur.....also, time of flight is going to be fractions of a second.....