There's no question that we live in the world where LLM AI was involved in finding the copy fail vulnerability at this specific time, and it's completely normal for people to see a vulnerability and then look closer and find related vulnerabilities or a deeper root cause, but there's no need to adopt an extreme "without AI LLM we don't find these vulnerabilities" position.
That is a very difficult fact pattern to which to attach the conclusion "LLMs have sabotaged security research" (my paraphrase).