If he has wood studs, this will be fine. There's plenty of strength so bending isn't the issue, but make sure you drill and screw into the center of the stud. A stronger attachment would be to use a foot of 2x4 placed vertically on the wall to spread the load, with the hook attached in the lower quarter. The 2x4 can be screwed to the stud, or mounted with hollow wall anchors.
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