This is a fascinating interview but one with some cringe-worthy exchanges on the part of the interviewer.
Asking about Moe's death, he wanted to know what made him "disappear," as if he was the victim of a mob hit.
When White said he and Moe weren't as sociable later on in their lives, he changes the subject right away instead of prodding for more on that topic.
A few minutes earlier, he wanted to know what prevented Curly from returning. I don't know, maybe a stroke?! Jules White's answer of "what?" to that question comes off as hilarious.