They probably should have added the disclaimer: opinions are my own..
Every company I've worked at has said very clearly not to comment about work things on social media. I would definitely have been in serious trouble for this. I imagine some strongly worded emails from marketing are flying around OpenAI right now.
If someone was speaking on behalf of their employer, they would've used the official channels (such as I dunno an `openai` HN handle, or whatever other channel).
I'm outraged that people think this "opinions are my own" disclaimer is ever necessary.