Because almost all of the people inside Iran have been disconnected for the past 35 days [1]. And believe it or not, they are texting these news live to all mobile phones on a daily basis as well. Some regime supporters believe it, because the want to believe it, they need to believe it. Just in the past 24 hours I have received 5 different messages from different organizations claiming victory and damage to US / Israel assets.
Just for a quick laugh, look at the official (Iranian) president's letter to the American people published yesterday [2]. The font changes between the paragraphs!
> Iran tweets about taking down an American jet basically daily.
Sure. We have two sets of demonstrable liars here. See, for example, the E-3 Sentry that got blown up; it took leaked photos for that to be admitted.
And don't get me started on the several times in the last few months we've "obliterated" Iran's nuclear capacity and missiles and whatnot only to be told it's time to do it again.
The claim being addressed is a shootdown over Qeshm island, which is the biggest island just west of the strait of Hormuz. The current CSAR operations are happening somewhere in the Khuzestan province. Probably somewhere within the 150 km radius of [1] based on online footage of the C-130 flying over.
Iran tweets about taking down an American jet basically daily. By their count we are down 40 f-35s, 4 aircraft carriers and thousands of MQ-9s.