The way that history is thought to kids is already romanticized to the point of bordering "alternative history" - and I'm not talking just about the US I don't know any country where history classes outside of universities aren't an exercise on building at least some level of civil religion. What Republicans want to move it to the realm of fairy tales.
Ah but it's so far just one (realistically probably a few) of them doing that in public. I give them a few years/months before it's actually official party policy