Unanswered by the article: Does any of that (joke or not) actually work?

It's input to the model, sure, but it would have to be a pretty dumb model.

I don't doubt that it's possible to create prompt injection attacks that work. I'm very interested in knowing how hard it is.

My intuition is that the models from this year are really hard to successfully inject.

The labs have been pouring a ton of energy into training against these attacks, as hinted from their system cards.

Doesn't mean they can't be beaten, but you likely need a whole lot more context than a short HTTP header to do it.

Testing now.