Sennheiser has confirmed that these headphones do not have active noise cancelling. The specifications in the shop are therefore correct. Kevin Hofer would have to explain what he meant by noise cancelling in his report. Thank you very much.

The tester probably simply misunderstood this. In-ear buds automatically have a certain degree of passive noise cancelling because you have to put them in your ear. The Transparent Hearing function does not deactivate active noise cancelling, as he wrongly assumed, but only amplifies the ambient noise that is picked up by the microphones.