Somewhat, yes. Obviously not unanimously among white people, but at least in this article, Stevens criticism of the movie as being gruesome does have a dose of white supremacy within it. The movie was not meant to gross out viewers; the so-called "gruesome" parts were to show the horrors of slavery. It's almost as if Stevens is saying, "It couldn't have possibly been
that bad. White people have decency!" Even if at a subconscious level, she feels a sort of unwarranted "solidarity" towards her race, which seems to exist today more than it should. It pains her to be reminded that White people were once that awful, so she wishes that the media would stop emphasizing the goriness of slavery, or slavery in general. There is literally no way that you can paint slaveowners as good guys during this era without being racist at KKK-levels, so people like her would rather they didn't continue to document it.
But if she was offended by how "gross" the movie was, she completely missed the point of it.