It definitely looks like a balanced (shielded) cable.
I prefer using a standard two core audio cable rather than a balanced (shielded) cable within the amp.
Rather than drag the shield through the amp, I connect it directly to the chassis at point of entry (the Neutrik DLX series have a feature just for this) with the shortest piece of wire possible.
“Balanced cable shields should function as an extension of the enclosure.” (Raine notes)
Spritzer has those PCB’s.