I mean I don't think he's getting ripped off by any stretch, just looking at some of the premade setups out there e.g. RedSea, Waterbox, etc this system looks cheaper of anything comparable when counting tank, stand, canopy, sump.
Not sure on the dimensions if the height is 18.5 or the width, if it's the height the canopy on it might look a bit weird and squash the apparent height a bit more.
Skimmer looks to be a bit overkill, but not tremendously so all of that depends on how many fish he plans on cramming in it. Could go cheaper with return pump and lighting if you wanted, not sure if that would be the best place to save money though.
I'm not a huge fan of those reefwave style pumps doubly so for only one being the only flow in the tank (outside of the return) I'd rather over spend with 2 pumps on opposite sides than have 1 pump as 48" is a long way to push water and that gyre action that is always showcased doesn't always work so well when the tank is full of rock.
Refugium light I would skip unless he absolutely wants a refugium
GFO reactor I would skip too as that's something you can always add later if you feel that piece of equipment is necessary
Ditto with the doser, while I know what I would want & need, does he know what he wants? Did he just say "I want a salt water aquarium of this size" and they told him all the equipment he "needs" ?
Not sure what "D Rock" means, obviously rock of some sort? but $900 for an undisclosed amount would worry me, I man a 40lbs box of marco is just over $200, are they going to do a fantastic reefscape where everything is glued together? is this an plastic insert?
Overally $9k for a 94 gallon system ... ooof, I'm glad I'm not looking to get back into this hobby any time soonif