That article is light on how they tackle the thermal aspects of NOX exhaust. The key challenge to diesel engines is that the combustion is essentially a chemic

That article is light on how they tackle the thermal aspects of NOX exhaust. The key challenge to diesel engines is that the combustion is essentially a chemical reaction in vastly different thermal conditions depending on the outside temperature. Every engine has a "sweetspot" thermal range where they are really efficient in burning diesel fuel and washing out NOX from the exhaust fumes. Once you're outside that sweetspot, there is little you can do.