Scientists confirm that parts of earliest genetic material may have come from the stars

Yup, but on a different site; it's a press release. I find funny that in my submission people were complaining that I removed the 'may' part of the title; in this one, people are complaining of the opposite ;)

Not at all.

If I am trying to reverse engineer a bread recipe, and find CO2, I will have confirmed yeast may have been used.

It's logically equivalent to "Scientists confirmed yeast could not be ruled out." That happens all the time. There is absolutely nothing to be bothered by. Running an experiment and getting a maybe is important and valid scientific information.

Personally, yes. But this is standard scientific nomenclature.