100% right. If you remove the banjo bolt from the oil supply pipe theres a metal gauze in the bolt thats guaranteed to be blockedhi, can't comment on the quality of the turbo but ild been checking oil supply to the turbo, that engine has a big issue with Carbon build up blocking filter in vacuum pump, oil pickup tube and little filter in banjo bolt on turbo oil feed pipe. Google dv6 turbo failure
Cleaning the engine out is a bigger job than fitting the turbo by some margin as well