Scientists: it has been shown that the adoption of new farming methods can enable some well-managed farms to reduce the use of chemical fertilizers, pesticides and antibiotics without significantly reducing or even increasing yields  Critic: that's not true  The farm you have chosen is the one that is most likely to succeed with these new methods
Why not mention farms that tried new methods but failed
The critic's rebuttal is beside the point, because scientists aim to show that something can happen, but it has nothing to do with whether the subject is representative or not.