Here is what I put as a comment at the end of the article:
The general idea that this relies on is quite sound. The underlying idea is the definition of consciousness.
Consciousness for any motile organism is the organism's ability to take its sensory inputs and use them to create a model of the future.
The only purpose of the model thus created is to allow the organism to successfully negotiate its environment.
This success, in turn, is the definition of what it means to say natural selection will select in favor of the organism.
Like every property of living organisms such a thing seems to be on a continuum of sophistication, all the way from cockroaches to birds, and mammals that are what we humans think of as conscious.