I agree with you. In a biology class, evolution is pretty much fact. When studying cosmology (the study of the origin of the universe including life), evolution is theory (in that the theory of evolution does not even try to address the origin of life). In the realm of philosophy, evolution and creationism have equal footing. The article says nothing about teaching creationism is the school. I just think it is pretty funny watching Evo-Reactionaries overreact.
Pointing out that evolution as an explanation for the origin of life is merely a theory encourages students to THINK IT OUT rather than spoon feeding them theories as fact basically telling them to not bother thinking about it since it has already been figured out.
I will say some are using measures like this to push for the teaching of creationism in biology class - I am against that. But pointing out that evolution is a theory and not fact is the truth and nobody should fear the teaching of truth to children.