This is not news. Anyone who ever bothered to learn a little bit of history knew Lincolon was not, by the standards of today, an egalitarian.
Here's a dirty little secret: there are very few unambiguous "good people" in history, at least as measured by how well they adhere to contemporary mores.
You mentioned abolitionists as examples of people who were not racist back then. Wrong. Probably most abolitionists had attitudes similar to Lincoln's: they were morally opposed to slavery, but that didn't mean they thought Africans were equal to whites, or that we should have a fully integrated, desegregated society.
Not only that, but many abolitionists OWNED slaves! Yes, it's true. How did they reconcile that with their abolitionist stance? The way people deal with cognitive dissonance today. (Do you shop at Amazon or Walmart, Shannon?) They knew their economic self-interest depended on something that was immoral, so they told themselves they were working towards changing things... but just not right now.
Much has been written about the feet of clay many of the early Founders had. Washington, Jefferson, and Madison all owned slaves, and all expressed opposition to slavery at various points in their lives. Alexander Hamilton was notably anti-slavery, but his in-laws owned slaves and he may have helped them purchase some of their slaves.
It is fine to want to see Lincoln in full context and recognize that he was not a modern "woke" President. But the standard you demand would require us to tear down every memorial to anyone born in an earlier age. You will find no heroes who didn't at some point express views that are, by today's standards, racist, sexist, homophobic, classist, ableist, xenophobic, etc. etc.