That article simply says that chemistry is chemistry, that there is nothing special about the molecules that make up what we call life. What makes you think there is anything special about quantum effects? All atoms and molecular bonds have them.
Chloroplasts in plants are at the equivalent level of
mitochondria. They are both organelles, effectively industrial complexes that contain machinery, within a cell. One of the machines in a chloroplast is the light sensitive chlorophyll molecule.
Quantum effects happen at, and below, the level of the molecule. They are most easily demonstrated using photons of light, each carrying a quantum of energy. That makes the chlorophyll molecule in a chloroplast easy to study. Mitochondria contain different molecular machines, molecules that are not selected to be sensitive to light energy. That makes it more difficult to study the chemistry inside the
mitochondria. You cannot compare a one molecule machine in a chloroplast with an entire
mitochondrial industrial complex.
You should consider the psychology of your assumptions. Your assumption that the science is little understood, is a simple reflection of your lack of knowledge of the subject. So long as you believe that you can, without much effort “know everything there is to know”, you will find you are confused by things that don't seem to add up or fit. You cannot see the forest because of the trees.
Students learn in a sheltered world. Lessons are prepared to be self contained, without unnecessary complexity. A good student is overconfident because they know everything they have been told by the teacher. A student needs to learn discipline and demonstrate humility.
On the other hand, an expert knows there is much more to explore and discover, and so builds their research on a solid foundation gained from years of experience. The expert has humility, and always struggles at the limit of their ability to understand the complexity of the world.
There is a close self assessment parallel in the Dunning-Kruger effect.
https://en.wikipedia.org/wiki/Dunning–Kruger_effect