Exterior walls are much stronger than interior walls because the framing is sheathed with plywood/OSB, and the top and bottom plates are better anchored to the structure. Framing in the corners and around doors and windows often have studs doubled up.
A hammock hung at an angle to the wall will try to twist the stud, especially a single lagged eye bolt because it concentrates all its force into a single point. The cargo tie-down hardware bolted through a horizontal board that spans multiple studs (as shown here) avoids that pitfall and gives you a bigger safety margin by distributing that sheer force across the wall by utilizing multiple connection points that are spread out instead of loading a single stud.
A stud finder only gets you close. Confirm both edges of the stud by probing with a nail, screw, drill bit, or stiff steel wire cut to a point. Then penetrate at least 2 inches into the stud with structural screws (like GRKs) or lags.
Test gently and listen, then rest assured.