Earlier quoted context omitted.
Something strange seems to have happened to America in the past ten or so years. People seem to have become hyper-literal and unable to detect any sarcasm, hyperbole, etc. I wonder whether this is due to spending more and more time communicating via the written word.
It probably wasn't a death threat, but I could see how someone might interpret that way. In the past 10 years? Deliberate misinterpretation of a joke or sarcasm is not a new thing.
It could be a non-plausible death threat though. And it's probably glorification of violence. I'd hate to be an arbiter of policies like this though. There's a line here between legally sanctionable speech (which I don't think this quote is), and what Twitter allows on its site.