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Hundo percent nailed it. Stem to offset comparison is nothing. Fork offset to grip offset _might_ be something, but probably not. Even if yes, the relationship would change with head angle as well.

Super misleading title. He switched from a 9 deg backsweep to a 10 degree. That would move the ends of his bars about 6mm backwards alone. The stems were only 1mm different. Depending on his bar roll, his hands were roughly 7mm back with the second setup.

Wow, that's absolute nonsense. Throw it on the large pile of snake oil and bad science that we have in this sport. The only thing that matters is where the grips are relative to the steering axis (grip offset). Where the bars and the stem clamp together is irrelevant. So many people swear by a particular stem length even when comparing vastly different bars, and the bars usually make a larger difference than the stem. Especially riser bars which change the grip offset a truckload depending on what angle they're rolled to. Even bars with the same sweep angle can...