The min network packet size is 64 bytes, so if they are bundling several small packets into one pseudo jumbo packet and handling it that way, something only using the same manufacturer switch could do as this would be propriety networking, then that could explain their calculations on their webpage.

The data is streamed within time slots, which is why cable lengths of Cat<=5 cable can not be longer than 100 metres @ 100Hz. Cat 6 is 55metres at 250Hz.

I dont know what their switch internal workings are, you'll have to ask them why they have quoted that speed, but I know some switches also have built in fibre network connections, as invariably with a network switch with many ports, you could get a queue of packets for one port so there must be some sort of buffering inside a switch to handle and minimise these situations.

It is only "clockwork" electrical pulses at the end of the day.