Apple very rarely admits mistakes. The fact they're rolling back some of the extremeness in Liquid Glass and actively mentioned in the keynote that they very seriously took the user feedback shows just how bad it was, at least initially.
Jobs: "You're holding it wrong, idiot." Also Jobs: fires the antenna designer
We could be holding it wrong, and Jobs be correct to point out that many rival phones at the time literally had manuals dictating how to hold their phones to avoid reception issues.
The antenna designer could have done a better job, preventing the situation, thereby not dragging Jobs into a PR storm.
Jobs could have handled the situation and communication _significantly_ better.