The guide is pretty dated and I am not even close to updating it for karmic but if you want the pulse-jack module for karmic you will need to build it from the karmic pulseaudio source.
Also, something you should be aware of, there is a continuing discussion about pulse-jack in the pulseaudio mailing list. Pulse and jack are now using udev and there seems to be some issue with how that is going to be worked out as far as the pulse-jack module goes. You should really look in the pulse mailing list before trying to use pulse-jack.
I think they are close to a permanent solution but there seems to be a way to do it now.