Is the use of mooted correct here? I keep thinking the author wanted bruited. Yesterday I heard an economist in the UK use it in the same way.
Coffee mooted as a breast cancer preventer.
The use of "mooted" here is correct. Your example is a headline - not a real sentence.
Moot in this case means:
In sentence form, the headline would include an "is":
Since the example is a headline, the missing "is" can be forgiven. The headline is correct.
The English usage of the word moot is:
Having studied law myself, I understand this usage most intimately.
Across the pond, the definition differs:
Thus, it seems as though our UK speaker may have meant that the topic of coffee as a preventor of breast cancer had already been discussed.