Did you read the OP link ? They go in far more details than just presenting what they did with AI, and they actually found several exploitable vulnerabilities, not just with AI, but with other techniques such as code analyzing or fuzzing.

AI is in he title, but the content is not entirely revolving around it.

agree it's an ad

but if they sent the AI through all that ancient code and that's all they found it's not a good advertisement

I think that finding and fixing this many vulns is a worthwhile achievement, no matter how they did it. But it does detract from the quality of the article that they are pushing CoPilot so heavily.