When you mount a SRW wheel on a DRW hub, the tire will be moved outward that 5 inches or so that is the difference in hub design. These hubs were not designed to be used with SRW wheels.
When used with correct wheel for the hub, the bearings, spindle, etc. can’t tell the difference (stresses are handled and cancel out within wheel and hub extension). When you use SRW wheel with DRW hub, and move tire 5 inches outboard, the stresses on bearings (particularly the smaller bearing at end of spindle) and on spindle goes up significantly.
If you were to install a DRW wheel backwards on a DRW hub (not what he’s done), it would move the front wheel out over 10 inches per side. I’m not sure if that’s what you were refering to in your first paragraph that I highlighted.
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