I'm not sure why that would be the case. First, I think most smart people already recognize that sufficiently complex biochemical systems can in fact perform computation as well as other abstract operations. Second, there is already a ton of literature in this area, it's often very helpful to analyze biological data from the perspective of various graph and sequence rewrite automata, but that doesn't necessarily mean that the underlying biology is explicitly exploiting matter at that level. Third, I don't see why having any such "proof" (to the extent that you can prove anything about biological systems anyway) would be an advance. What new predictions would you be able make?