YES

Problem:
 dfib(s(s(x)),y) -> dfib(s(x),dfib(x,y))

Proof:
 Matrix Interpretation Processor: dim=1
  
  interpretation:
   [dfib](x0, x1) = x0 + x1 + 3,
   
   [s](x0) = 4x0 + 5
  orientation:
   dfib(s(s(x)),y) = 16x + y + 28 >= 5x + y + 11 = dfib(s(x),dfib(x,y))
  problem:
   
  Qed