He can teach his kids what they want, no law against that.
His Young Earth claims are the most problematic, which is why there are old Earth Creationists. They realized the required convolutions of fact and logic were too great for them to argue.
We definitely see what appears to be starlight.
There are people that don’t think he should be allowed to teach his kids or me and my kids whatever he wants. Bill Nye is one of them which was the entire reason for the debate. As a conservative you should oppose that opinion.
There are actually many types of old Earth Creationists. One problem that happens is that the term “Creationist” is generally used and thrown around and has become attached to Young-Earthers. Overall there are several Creationist Theologies of differing types:
Day Age (Old Earth Creationism) (unique creation, old earth)
Progressive Creationism (kind type creation, microevolution, old earth)
Theistic Evolution (God initiated, non-involved, scientific ecolution, old earth)
Evolutionary Creationism (God initiated, God-guided, scientific evolution, old earth).
I list the last two seperate, though sometimes they are combined due to them using the same general evolutionary model, but differing only in their theological rather than observational aspects.
This debate between evolution vs. creationism gets painted as a debate between Atheism and Christianity, and that is far from the case. All the “evolutionists” are not “Atheists”, many of us are Christians.