Well, yes. You don't find something if you don't look. The LLMs did the looking before the humans did, so they found the vulnerabilities.
It's definitely worthwhile to point out that LLMs have changed the economics of looking; we can now look in far more places far more quickly than we could before. But the above points were that the vulnerability itself happened to be an easy one that didn't intrinsically require an LLM.
Isn't the issue here that they used something like Artifactory for this purpose in the first place? It is not intended as a robust and secure packet manager for sandboxes. Why would any human look for vulnerabilities in Artifactory at all? So the scenario never arose where a human was incentivizied to scrutinize Artifactory, something that was never needed because it was never intended for the purpose of being a packet manager in a secure sandbox.
Means the problem lies elsewhere: deciding to use it at all. That points again towards the lack of basic SysAdmin skills.