I understand and agree with many of the arguments made against Song of the South, but I've also long been of the opinion that Disney's treatment of the film and the rise of Buzzfeed and other tabloid websites that shared clickbait articles about Walt Disney's banned, racist film added fuel to the fire and created a public perception that the film is far worse then it is.
And none of the issues with Song of the South are present in Splash Mountain. Disneyland thrives on mythology- it has adaptations of European fairy tales (Fantasyland), American folklore (Frontierland), I think it makes sense to have an adaptation of African folklore as well.
I remember this video got shared here a few months ago, and I think this lady is spot on in her observations.