My post does describe a distinct model based on a Many Worlds interpretation where the probabilities are computed differently based on whether entanglement occurs or not - i.e. whether the universes influence each other. It is distinct from the typical model of decoherence.

As for photosythesis, it ought to behave in much the same way, as a network of states propagating through entangled universes, with the interactions of the states in those branches causing the highest probabilities to be assigned to the branches which have the lowest energy barriers.

Of note, there are other, more esoteric models based on even more unusual interpretations of quantum mechanics, but I suspect that's not something we need to get into here.