It looks as if the German Cancer Centre regularly spews out this kind of rubbish. Dr K Farsalinos, the cardiologist and researcher, has discussed the latest episode here:
German Cancer Research Center and the case of formaldehyde in e-cigarettes - Countless mistakes, impressive misinformation
It tells you all you need to know about these liars (they have taken some junk science and then lied about the implications of it). Dr Farsalinos clearly points out how they are basing propaganda on lies, misrepresentation, misinformation, and omission.
These cases are normally based on crackpot ideology, or pharmaceutical industry funding, or a mix of the two. For medics to lie about the science, and deliberately try to obstruct public health advances, indicates there is a problem with some sort of a conflict - either ethical, financial, or both. In a perfect world such people would be struck off and/or prevented by law from working in any field related to health.