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Your CNN link doesn't state what you said it does, but I'm aware that some, including members of the artist's family, have made the subjective claim that it glorifies slavery and the Confederacy.
My subjective claim is it depicts scenes of the soldiers going to war. In the South, for the few soldiers that were wealthy enough to own slaves, it was common for them to follow their masters to war - as is depicted on the monument. I think it would be more racist to erase from history the fact that they existed and were caught up in the whole bloody conflict.
A year before the monument was erected, Union and Confederate war veterans gathered at Gettysburg, as President Wilson said, "as brothers and comrades in arms, enemies no longer, generous friends rather, our battles long past, the quarrel forgotten":
These Union soldiers had been shot at by the Confederacy and many of them had lost family members and friends in battle - yet they were able to reconcile.
This monument to reconciliation was erected and unveiled by President Wilson in that spirit.
Unlike many "confederate statues", this marks an incredibly important part of our nation's history. The ability to make peace with one another.
I encourage all to read President Wilson's address to see how far our nation has fallen from these spirits of brotherly love:
One quote from it to leave you on:
"My privilege is this, ladies and gentlemen: To declare this chapter in the history of the United States closed and ended, and I bid you turn with me with your faces to the future, quickened by the memories of the past, but with nothing to do with the contests of the past, knowing, as we have shed our blood upon opposite sides, we now face and admire one another."
Apparently the chapter isn't as "closed and ended" as President Wilson had believed, as 100 years later we are opening it right back up.