This thin may not use any PCB traces in the signal path, but there has to be alot more than 1.5"-2" of wire.
Each of those cables is soldered into the PCB to anchor it, and comes from an RCA jack. More than 2" right there. I would guess that the connection is p-p wired on the bottom from these cables to the relay signal terminals, then these have to go from the entry relay to another or other relays, each wired with additional wire, then finally back to another relay and to another jack.
Kind of an over the top cool piece of gear, but as Nate said, at the end of the day, it is only a switchbox. Albeit one with alot of features probably not present on any other piece of gear (ABX testing, etc. from the sounds of it, though I did not read the entire product lit. nor the review).