They are not. Many independent organizations since then did the tests to confirm just that.
One German magazine made a test of several diesel cars, and threw in one benzine one. In their test, only one - diesel! - car complied with the advertised emission standard. (Don't remember the brand (not BMW). What was surprising to me is that even the car running on benzine produced the NOx.)
Another German magazine did a test too, and IIRC only BMW diesel emission was within the advertised emission standard.
The larger problem behind the scenes is that the manufacturers have promised too much to the regulators but couldn't deliver. Thus the existing Euro 6 emission standard, established on the said promises, is simply not implementable at the moment. The industry insiders told that the emission limits should be raised by at least 70% to be in alignment with the current level of technology.