I think the best steelman argument for YEC is that God simply created the world to seem old to science.

According to those who buy into a YEC interpetation of the BIble, God wrote it and indicated the earth is 6,000 years old and therefore it is 6,000 years old. It is inconsequential what sience has to say about it, since a sufficiently powerful God could easily make it seem as if the godless scientists and their fancy evidence are right.

The truly faithful will eschew "human knowledge" in favor of Godly Wisdom, trusting the Lord and having faith no matter the secular evidence says.

In my view, that is the only steelmanning that works for Creationism. Appeals to science and evidence by these folks always seem quite silly.