Do you mean "Irregular was not involved (we know for certain)" or "Irregular was not involved (as far as we know)"?

There's very little reason to believe Irregular was involved in that incident, and the article presents no evidence to that effect. So it's "There's not a teapot orbiting the sun somewhere between Earth and Mars (as far as we know)."

OpenAI explicitly stated those were separate incidents: https://openai.com/index/third-party-cyber-evaluations-invol...

We know for certain. The involvement of Irregular in the other cases was never a secret, they were quite open about what they were working on and the results of the evaluations were being published on their website.

If you want to believe without evidence why bother to read articles? Faith doesn’t require that, but if you’re serious then a lack of evidence is important.