Correct, comes in the kit.
The unit comes in a kit including 3 antennas, PS w/cable, case, foot pads, small screwdriver w/spare screws, OR assembled board only. I would be wary about any vendor that says the PS doesn't come in the kit.
Box depicted in the review photo from your link is identical to what I received via Sinovoip that I ordered from.
According to post 1 here Yes.