It amazes me all the people jumping all over this. Tiger was trolling (some)... If you watch the other videos in the series he still doesn't "share" his swing tips/thoughts completely. It's bits and pieces here and there.
I can tell you, he was taking divots on the range at Augusta. He was also not taking divots during some periods, mostly when working on flighting his ball differently. Mostly, the "no divot" thing is something he does to eliminate impact pressure on his body (back) for longer sessions.