Yes, this is very surprising. Perhaps during 40+ interviews he let one slip. But as you say, I would think he would have an agreement to exclude future product references in the event Steve did let one slip.
I wonder if Steve would be still alive today if he had cancer surgery right away. From what I read on this site the cancer was just in his pancreas at the time of discovery in 2003 and had spread to other organs by time he had surgery 9 months later.
As mythical as his accomplishments were, Steve Jobs was human. Humans make mistakes. He regretted his mistake too. It's sad that this mistake might have cost him his life. But he might not have survived even if he had surgery right away. Pancreatic cancer is dangerous in all forms.