Ah, thanks for the link. I saw several headlines about it when that “news” dropped, but only followed one, and it claimed an FBI source. It may have been even worse than the others, and downstream from them, so to speak.
I similarly delayed accepting Charlie Kirk had actually died because the only source I could find was President Trump (and news sources reporting Charlie Kirk's death that, ultimately, seemed to be using President Trump as a source).
Since President Trump is an extremely-well-documented liar, this was not a reliable source. It can be hard to figure out the source for news like this, since news outlets are not in the habit of doing well-disciplined source citation or summarizing sources to make it easy to identify them (in contrast to, say, a research publication).
(I did believe it, but only because I’d watched the close-view video and regarded survival as all but impossible… without that I’d have “grain of salt”ed it, too)