Looks like injector cleaner is really all that it is.
They claim:
Lucas Diesel Deep Clean is a new technology designed to reduce particulate matter in diesel particulate filters (DPF), which helps extends the life of the equipment. Particulate matter is a major contributor to the degradation of DPF systems. Our product cleans fuel injectors, restores power loss and improves acceleration. It restores engine performance and improves fuel economy and reduces NOx emissions.
They claim new technology but it's not. They claim this new technology will reduce particulate matter in the DPF, but so will injector cleaner and a cetane boost. Then they say particulate matter is a major contributor to the degradation of DPF systems, which is like saying water is a major contributor in getting wet when you jump in the pool.
I've never been a big fan of Lucas anyway, but certainly not since they got busted putting Sprinter MB (and VW) spec on their oil bottles when the oil hadn't even been tested, much less approved by Mercedes. And when Mercedes did test it, it was a high ash oil that not only didn't meet any of Mercedes specs, it didn't even meet the API SL, SJ specs. It was good lawn mower oil, for a really old lawn mower, though.