This has been widely reported - especially by people who think LBJ was deeply involved in the plot.
If you want more go to YouTube and search “the men who killed Kennedy” There was a series, British, I think.
They go through most of the theories (some more believable than others). One of the series covers LBJ, and his past dirty deeds. Even his mistress at the time thinks he was involved in the plot, or at least knew of it.
It’d be funny if their app was created by the same folks who screwed up the Obummer care web sites early on.
Count on the Dimocrats to “improve” a process and make it completely unusable.