Regarding your point #2, it is correct, and is consistent with the original article, not in disagreement. The problem is that the article summary is mischaracterizing the article.
The summary says: The study showed that a persons unique odor stayed the same even if they varied their diet with strong smelling foods such as garlic and spices.
The article says: Scientists revealed an individual's odour signature remains detectable even when their diet is changed to include strong smelling foods such as garlic and spices.
So the article doesn't say that a person's odor doesn't change even if they vary their diet. Anyone whose eaten garlic knows that to be plainly false. It says that a person's unique odor signature is detectable even if they eat strong smelling foods like garlic, i.e. the garlic does change their scent, but the body's unique contribution is still detectable under the garlic.
So nother actually is a word.
/me cries
Happiness is twin floppies.