Not seen anyone stating that it’s all a measurement mistake or anything.
So, who thinks what over this?
I do think that diesel manufacturers have a problem. One rather created by regulation. First it was we’ve got to get the mpg up, then reduce CO2….and diesel does both of those well. But then in came stricter regulations on particularates and NOX, which diesel does badly. But they’re already billions in the hole in engine design.
One can see the temptation, but it’s still amazing that they did what is alleged: if they did.