The linked video is just a small clip of the whole thing which unfortunately isn’t viewable (legally) in the UK. If you are in America, you can watch the whole interview on the CBS website.
First time an Apple exec has been on a comedy talk show? Pretty good interview really, Cook gets to show off his less serious side a bit. I think Cook does a bad job of explaining 3D Touch but he knew the technical details about the technical reasons why they haven’t made preinstalled apps deletable in iOS, which shows he knows the details. He also basically confirmed that Apple will offer a way to hide stock apps in the future which is a nice iOS feature to look forward to.