i just found this on yotatech
For most all suspension lifts (except XREAS), when you lift you also get longer shocks as part of the lift. The reason is that the shocks can only travel so far up or down before they max out. The longer shocks compensate for this. With XREAS, it is technically possible to replace the shocks, but no one makes longer XREAS compatible shocks. You could also technically dump your XREAS system and replace it with a standard system, but that would mean throwing away a pretty decent system for on-road handling.
Relocating the XREAS shocks seems to be a best of all worlds option. You get to keep your XREAS system, you get to keep your lift, and the XREAS shocks won't be maxed out as easily as without the relocation.
All that being said, there are certainly a lot of people running Daystar and Revtek spacer lifts without the relocation mounts and I have yet to hear of a problem. Personally though, I would consider this as cheap insurance for your XREAS system.