Yes, it's often used as clickbait, but I hope you don't take an adage as fact. Especially when your own source says the adage is wrong.
A 2016 study of a sample of academic journals (not news publications) that set out to test Betteridge's law and Hinchliffe's rule (see below) found that few titles were posed as questions and of those, few were yes/no questions and they were more often answered "yes" in the body of the article rather than "no".
A 2018 study of 2,585 articles in four academic journals in the field of ecology similarly found that very few titles were posed as questions at all, with 1.82 percent being wh-questions and 2.15 percent being yes/no questions. Of the yes/no questions, 44 percent were answered "yes", 34 percent "maybe", and only 22 percent were answered "no".
In 2015, a study of 26,000 articles from 13 news sites on the World Wide Web, conducted by a data scientist and published on his blog, found that the majority (54 percent) were yes/no questions, which divided into 20 percent "yes" answers, 17 percent "no" answers and 16 percent whose answers he could not determine.
That's a fairly spot on breakdown. The key thing is that the All-domain Anomaly Resolution Office's goal is "resolution", so they'll be focusing on cases they can resolve. Some of these cases are "resolved" if they can be partially replicated.
Take for example the Eglin UAP sighting, which AARO was able to replicate "some aspects" of with a commercial lighting balloon. "AARO conducted extensive testing using one of these balloons and found it could replicate some aspects of the pilot’s account." Because of that, the case is marked as "resolved" with "moderate" confidence.
They didn't confirm if any of these lighting balloons had been lost. And, while these balloons are powered by cable, AARO concluded that they could have been adapted to use a battery. Though, that would also limit their time powered and make it easier to pinpoint the source of a lost balloon. But, because some elements could be replicated by making adjustments to a physically similar object they were able to "resolve" the sighting.
Even with that approach to resolution, they still have unexplained anomalous events. And, it's completely understandable that there will be cases they can't explain or can't admit to publicly. However, their attempts to dismiss the truly anomalous events have been disingenuous.
https://www.aaro.mil/Portals/136/PDFs/case_resolution_reports/Case_Resolution_of_Eglin_UAP_2_508_.pdf