Then again maybe the quality of Lincoln's literacy defies it.
I think so. My first thought reading this output is that I should ask the LLM to first write in the style of Lincoln and then slightly modernize the prose.
This is all just demonstrating the helplessness that's coming to our society w.r.t. dealing with gen AI output. Looking for em-dashes is not the solution and distracts from actually having to deal with the problem. (Which is not a technical but a social one. You can't solve it with tech.)