The article states why they have made this decision. They are concentrating on the US and China with this car because it isn't selling in Europe.
"Western Europe remains the most challenging and competitive region for premium cars," Infiniti's chief spokesman, Trevor Hale, said.
Instead, Nissan plans to promote the Infiniti brand in the US and Chinese markets.
In the US it plans to focus Infiniti on sports-utility vehicles and in China it plans to launch five new vehicles."
Pretty plain to see there, the model isn't selling in Europe so they're pulling out entirely.
"The Infiniti line-up of cars will be electric from 2021 and diesel versions will be discontinued, the company said."
Nothing to do with diesel or the move into electric, nothing at all. Brexit, that's yer man.