At some point I'd expect these questions to have come up enough for you to have some basis on which to speak. By the tenth interview asking a similar question, are you still trying to come up with something brand new on the spot? I have a lot of the issues mentioned in the article from face blindness to a general lack of memory around events. But I've talked about the time I accidentally ran "rm -Rf /." instead of "rm -Rf ./" on a production system on one of my first jobs and the lessons I'd taken away in probably over a dozen interviews during my life. I don't have to try to remember it.
One of my favorite managers comes across as a very charismatic person who always had great stories to tell about his life and work. After working with him for years, it became clear he had half a dozen decent stories he could tell well and rotated through them. Enough new people were introduced and others enjoyed his stories so would encourage it "Tell them about the time you worked for the Canadian Mafia!" They were crafted by that point. He didn't have to "remember" them so much as they were tools in his belt that he could pull out on demand. I'd guarantee some of those stories come out when he interviews somewhere.
One of my favorite managers comes across as a very charismatic person who always had great stories to tell about his life and work. After working with him for years, it became clear he had half a dozen decent stories he could tell well and rotated through them. Enough new people were introduced and others enjoyed his stories so would encourage it "Tell them about the time you worked for the Canadian Mafia!" They were crafted by that point. He didn't have to "remember" them so much as they were tools in his belt that he could pull out on demand. I'd guarantee some of those stories come out when he interviews somewhere.