They presumably first read an article on another site such as CNN that mentions electronic jamming: https://www.cnn.com/2019/07/18/politics/trump-us-destroyed-i... but then decided to share an article based on it from a particular well known source such as WSJ in this case, that happens not to mention what they included in the title. So yes, the person should have shared the actual article they read and that they based on the title on.

My fault. That's exactly what happened. I saw it first on CNN, but posted the WSJ article (just because I find WSJ to generally be a better source), but it was only after posting that I realized the WSJ didn't mention "electronic jamming", which was actually the reason why I thought it was interesting to HN in the first place. Curious why the WSJ did not mention that.

Submitted title was 'U.S. Destroys Iranian drone using “electronic jamming”'. We changed it to the article title as the site guidelines ask.

https://news.ycombinator.com/newsguidelines.html

The linked article doesn't mention it.

CNN reports[1]: The drone was destroyed using electronic jamming, according to a US defense official

1 - https://www.cnn.com/2019/07/18/politics/trump-us-destroyed-i...

It is mentioned in this article.

https://www.cnn.com/2019/07/18/politics/trump-us-destroyed-i...