In fairness John, I think that he says that in reference to my point about rendering video for web delivery.
I was refering to delivery on DVD. I believe he says that deinterlacing shouLd be set to none for this.
” In theory, the best quality you can get from an interlaced source is to keep it interlaced. All the DVD players can deinterlace properly and they won’t let you notice if the source was interlaced or not. So, even if the TV set is the latest progressive one, if you watch the footage through a DVD player you are safe with your interlaced source.”