True, but you have to see it from the other side: on a dry runway wheel and aerodynamic braking is sufficient to achieve the decelleration rate. i.o.w. You don't need the reverse thrust to get it.
This might not be the case on a slippery runway where T/R is needed to get the required deceleration rate.
So the fact that on a dry runway an adjustment has to be made for not using reverse thrust is hard to explain (theflyingbus' problem). On a slippery runway this is obvious.