scook
Yeah, I would have guessed phase shifter too, had I not found the article which I linked above. Of course, it does not go into any detail about the recording.
If it
is a Leslie, it's the only guitar-through-Leslie-at-the-higher-speed I've heard with that timbre. I think the bottom line is that if someone wants to reproduce that sound, they'll come a lot closer with a phase shifter than with a Leslie. Player may have been using one of the many Leslie simulators, like the Rotovibe, and that detail didn't make it into the article.
Listen to the opening to the J Geils' band "The Usual Place"...that's what a guitar through a Leslie at high speed sounds like. It has much more in common with tremolo than a phase shifter.
Oh, and to keep the lawyers at bay...Leslie is trademarked by Hammond Suzuki, USA Inc.