That cyberattack is a sign of lack of safety, not of safety. It happened by accident.

"A model being tested broke out of its sandboxing and hacked a production system of a different organisation using a previously-unknown vulnerability, in order to steal test results, and that proves anthropic were worried for no reason months ago about future models being security issues" ...?

Anthropic have released a lot of security patches in recent months, so many that many open source maintainers are facing burnout (google it). It's public knowledge that they weren't lying, you can look at the code. Their ridiculous guardrails were so that projects could patch and prepare for more models like this one coming out.