Sire must be super dark brown (like the stallion Gatsby for example), because the baby is definitely smokey brown IMO. Dam would then be smokey black, which is what they seem to be trying to describe with the term "black buckskin". Could be the other way around, too, of course. Pictures of sire and dam would help determine their colors, but regardless I'm quite confident that the foal is smokey brown.
There is something about riding down the street on a prancing horse that makes you feel like something, even when you ain't a thing. ~ Will Rogers