What David McCullough said about the Confederate flag in 1993

I wonder if he has changed his position. I found this on historian Kevin Levin’s Twitter feed:

Came across my feed this morning. Here is David McCullough responding to a question about the Confederate flag in 1993. https://t.co/QtSOXCJWd2
— Kevin M. Levin–Historian, Teacher, Public Speaker (@KevinLevin) March 1, 2022