You're right Harry. This sentence is extremely badly written/confusing. What I was meaning is that on such a setup, the servo slop becomes significant to the control travel. That is not because of the control link geometry but because of the aero dynamical configuration/ ATV.
7 degrees of deflection is very small plus the servo is only used at +-35 ° of deflection ( 60% ATV ? ). So the slop will be more significant compared to the total servo angular deflection used.

However, maximizing the mechanical advantage WILL minimize the influence of the servo slop, which is what you have done in this case ( de-amplify the servo slop at the control tip ).

I am still surprised as well to see such a small torque value required. I guess that on this servo power segment, the critical factor to choose it would be the servo reliability...

Did you manage to find a servo arm that gives you 0,7 cm of leverage ?