From what I read the actual escape was through a proxy that allows downloading Python packages from the internet. It's not supposed to allow general internet access but the AI found a previously unknown vulnerability in it. That is hardly "standard and well documented script kiddie methods", nor does it seem like criminally negligent sandbox design, though clearly they will need to reduce their attack surface in the future. I hope they are working on a physical air gap and faraday cage because it seems like it won't be long before it is legitimately required.

Ah, yes. The airgapped lab with internet access.