First, it is definitely NOT against either federal law or Supreme Court precedent to teach about scientific criticisms of Darwin’s theory.
Most Darwinists are far savvier in how they seek to persuade the public.
That framing is backwards, or perhaps upside-down, probably in order to make the paper by Granville Sewell sound unreasonable.
A helpful formulation comes from podcaster Scott Adams, of “Dilbert” fame, who comments entertainingly on the political scene.
Because the challenge is perennial, and because we’re not all philosophers, it’s good to come back to it from time to time.