Well, the model is relevant to to the rule, according to this item on p.3:

"13. If the model airplane is built from a commercially available kit, all servos installed must meet or exceed the
kit manufacturers’ specified torque."

Apparently scratch builders are subject to sticking with the specified pivot axis, but ARF and kit builders can defer to the mfgr, who is presumed to know the minimum safe servo torque required.

Scratch builder needs to produce an additional kit or two for sale to his buds, then the required torque per the rule is whatever he says.