You're confusing prompt injection with jailbreaking. The danger of prompt injection is that when your GPT tool processes 3rd-party text, someone else reprograms its instructions and causes it to attack you or abuse the privileges you've given it in some way.
> spreading basically FUD around GPT
My impression is that Simon is extremely bullish on GPT and regularly writes positively about it. The one negative that Simon (very correctly) points out is that GPT is vulnerable to prompt injection and that this is a very serious problem with no known solution that limits applications.
If that counts as FUD, then... I don't know what to say to that.
If anything, prompt injection isn't getting hammered hard enough. Look at the replies to this article; they're filled with people asking the same questions that have been answered over and over again, even questions that are answered in the linked presentation itself. People don't understand the risks, and they don't understand the scope of the problem, and given that we're seeing LLMs wired up to military applications now, it seems worthwhile to try and educate people in the tech sector about the risks.