The writing here isn't the highest quality, and the thoughts were a little confused, though I agreed with some elements.
It's true that Black writers' work tends to be seen as primarily engaging with race, sometimes to the detriment of other elements within it. This is true for sci-fi writers as much as it is true for intellectuals like Du Bois. That's as far as the point goes, though. There are too many complicating factors.
1. There are several theories of interpretation in the field of literature. The author of this article defaults to authorial intent, which is only one among many- it's ok to read a book through a racial lens without thinking one has exhausted all possible interpretation of the book, and furthermore, it's ok to read a book through a racial lens against the author's intention, because a book is a work of art separate from its artist. It can be read in different ways to produce different effects, and all of those should be explored.
2. The author tries too hard to put race in opposition to other themes- it's possible for race to be part of a story without being the only part, or even the most important part. Some of the examples used by the author are stretched to make it seem as if any mention of race within them automatically devalues the rest of the work, which is absurd
3. The author tries too hard to define speculative fiction against its own history. Science fiction has always included social commentary on the present- it's a literal attempt to imagine the future based either on projecting tendencies in the present into the future or a contrast between a radically-different future and the present. Race and racial difference were part of Sci-Fi's DNA from the outset, just as they were part of the currents of social and political discussion and reality and still are, so it's no surprise that the genre would continue to address these themes. Indeed, several of the authors mentioned in the article have explicitly written major works that focus on race. Science fiction isn't and never was just about science and technology, and developments in science and technology are impossible to imagine or conceive even remotely realistically if one divorces them from a social and political context- see the case of replicators in Star Trek, for example.
In short, there's a weirdly inaccurate and exaggerated element to this article that seems to be based either on an anti-political/pro-colorblind or even self-hating stance.
First, it's Geordi La Forge.
Second, some of the most critically acclaimed sci-fi writers of all time are Black, like Samuel Delaney and Octavia Butler. Even Du Bois wrote a sci-fi story... Futurist tendencies have been present in Black culture for a long time:
Afrofuturism - Wikipedia, the free encyclopedia