Sentences like this, i.e. "everything turns more complex", must be formulated much more precisely in order to become true.

The article talks a lot about biological evolution, but in that case the only claim that is likely to be true is that the complexity of the entire biosphere increases continuously, unless a catastrophe resets the biosphere to a lower complexity.

If you look only at a small part of the biosphere, like one species of living beings, it is extremely frequent to see that it evolves to become simpler, not more complex, because a simpler structure is usually optimal for constant environmental conditions, the more complex structures are mainly beneficial for avoiding extinction when the environmental conditions change.