Small box connected to USB containing "several gigabytes of dedicated static RAM" that "takes over the low-level functions of the board" does not sound to me as

Small box connected to USB containing "several gigabytes of dedicated static RAM" that "takes over the low-level functions of the board" does not sound to me as something that is technically possible (and the SRAM part does not even sound reasonable). In my opinion, if this thing works, it works on some trivial principle, my guess is that it is more or less flash drive with some form of hypervisor, or scam...