From what it appears to me, they are just selling a CV drive shaft and an output shaft adapter to allow the use of the CV shaft. The pic of the shaft installed shows a new (aftermarket) output yoke on the transfer case. The same as is required to do the standard SYE kit that involves opening up the case and removing parts. I don't really see how they can state that you don't have to tear down the case when it shows the aftermarket parts. This is how I am seeing the page, others may see it differently.
Personally, I would go for a tried and true SYE kit. Good luck with your choice.