What's the evidence for there being an existential risk? We are provided scenarios which read like science fiction about RSI and ASI right around the corner, resulting in magic sounding technology that can do anything the person making the claim wants it to do, because it can just make itself smart enough in a short amount of time. But the person making the claim has to actually show how such a thing is possible in the real world, not just a story.
The clear and predictable power of AI is the evidence for existential risk. Even if we don't get RSI or ASI, there's a risk we'll automate our world, then it'll break and we'll starve, etc.