So there is a system, but it is so ineffectual that it is inscrutable.
If I were to describe it, straight up defensive strategy, block shots, uncontested neutral zone, with no consistent approach to entries, so a reliance on counterattack/rush rather than any approach to hold possession for all 5 active in the zone with puck support.
Honestly, call it a system, but it is better described as a simple strategy. I don't think Nolan's a moron, I just don't think his approach wins in the NHL even with talent.
So there is my plain bias.