Do you disagree with his conclusion that our original electorate chose more wisely than we do today? I think it's pretty hard to argue against it. We have people who are as wise and honorable as Washington, Adams, and Jefferson, and plenty have run in both parties. They just can't win, because of our electorate. We consistently choose slickness and style over character and substance. Back in the day, we also had people who were as crappy as Joe Biden, Donald Trump, Barack Obama, George W. Bush, and Bill Clinton. We would let them sell snake oil to stupid people, but we weren't going to let them become presidents of the United States, because the people who bought snake oil usually weren't allowed to vote. We knew better.
I also don't think he's mouthing a David Duke talking point. Duke would argue that their choice was inherent to their ethnic and racial background. It's the same logic that the rest of the alt-Right and the CRT people on the mainstream-Left (can't really call it "alt" at this point) espouse. They just reach a different conclusion and moral judgment about it, and of course, they're both wrong. The reason why our early electorate chose wisely is that they were the primary people in the United States who were broadly literate and well-read and shared what we'd call Western values. They were white, but they didn't have to be, and of course, in some states they weren't all white. (For example, Vermont allowed both of their black people to vote as early as 1791.) If we had kept the same restrictions but didn't racially discriminate, we likely would have gotten the same or similar outcomes.
Just look at who our nominees for President have been the last several cycles. It hasn't been the best and brightest.