Network Switches

From what I can gather from the links to the 3 switches mentioned in the OP the sotm switch is not a managed switch but a basic level 2 switch so I can’t see anyone being able to manage changing packet rates. I haven’t found as much on the other 2 but they look to be basic level 2 switches as well, perhaps someone has more info on them.

The man who did the measuring also did a listening test, said he found it didn't  sound any different than his regular switch, said it might be worth $100 but not $680. 

If you read through the comments you will see that he tested the etherregen switch with a schiit modi  dac as well, it showed no difference either.