There's that and also what is said in public. I think what mcd said about Allen is fair tbh.
There would normally be a more balanced assessment of 'things he did well, and throws he'd like back. '
It was a short presser and he wasn't asked questions about who was to blame, was just asked specifically about Allen. I do take your point as a leader you would expect a bit more humility, accountability but I think the narrow range of questions asked also contributes to this narrative of McDermott blaming Allen.