Great link, John. I see some pretty weak assumptions, IMO:
" ... the only way for the light energy to find a reaction centre is to bounce through the protein network at random, like a ricocheting billiard ball. This process would take too long, much longer than the nanosecond or so it takes for the light energy to dissipate into the environment and be lost.
"So the energy transfer process cannot occur classically in this way. Instead, physicists have gathered a variety of evidence showing that the energy transfer is a quantum process."
Once again, researchers are relying on the probabilistic, linear nature of quantum theory (superposition, non-locality) to arbitrarily rule out classical processes. In fact, complex systems science is scale invariant, and principles such as the law of requisite variety, small world networks, nonlinear feedback functions, have the potential to explain microscale effects without the conventional quantum assumptions.
Tom