From what I read, its a statement about intelligent design. Its not being taught at all. Its merely a disclaimer that there might be a different opinion called intelligent design.
How does that violate the Constitution?
I have a feeling that is going to be lost in the trial: that no one is teaching intelligent design.
They could also read a statrement in physics class that there are differen opinions about the shape of the earth.
You 'hit the nail on the head', I hope that others realize that this case is not about teaching an ID curriculum but simply reading a disclaimer.