A chat archive is people talking. A panel dump is records — generated by the operation for its own use rather than asserted to anyone.
The most sensitive coordination in any organisation is the least likely to be typed. The archive is a survivorship sample of itself.
The operation describing itself, to itself, with no expectation of being read. Nearly everything else in this corpus is an attacker described from outside.
The rule requires disclosure of a material incident. It does not require the company to show its working — and Halliburton said so, in writing, to the SEC.
No exploit and no zero-day. An account existed, it had a guessable password, and nobody had required a second factor on it.