Even the author seems to agree (also from Wikipedia): "In an interview, Harvey stated that her goal was to write the novel as a "space pastoral", focusing on realism and the beauty of space rather than the speculative nature of science fiction."
EDIT: Oh, actually, missed that Atwood won it for The Testaments! Yeah, I mean that is clearly scifi.
This might make MJH the first Sci-Fi author to win a Booker prize for a Sci-Fi novel.
I would have a hard time countenancing an argument that The Handmaids Tale (and by extension, The Testaments) is not sci-fi, in a world where Heinlein's "If This Goes On—" is widely regarded to be sci-fi.
On the other hand, if Atwood doesn't wish to be regarded as a sci-fi author, so be it
She's repeatedly said she doesn't. Indeed her dismissive remark that "SF is that 'squids in space' stuff, isn't it?" is what inspired the great Ken Macleod to write his "Engines of Light" trilogy which starts with Cosmonaut Keep.
Due to her attitude I've never even tried to read any fiction of hers. Macleod is a genius nearly on a level with his close friend Iain Banks.
I am with the other commenter in this thread: I've read quite a few (usually very highly-regarded) alleged SF novels by literary authors who say they don't write SF. I have hated pretty much every such book.
In fact I don't think "The Handmaid's Tale" really makes sense without the context of the AP feminists. Gilead comes about, as I understand it, because the AP feminists think they can use the Religious Right to achieve their goals and unsurprisingly that goes badly for them. AP feminism doesn't even exist when "Left Hand" was published.
But maybe that’s just post-hoc rationalization for a reactionary stance, idk.
Needless to say, I will also never read any of her work.
[1] https://globalnews.ca/news/3707723/margaret-atwood-condo-con...
But the difference is that Atwood was, when she wrote "The Handmaids Tale" an author but not a Sci-Fi author. Whereas Butler and Miller were Sci-Fi authors.
And yes, "is this book sci-fi?" is a fuzzy category, and of no great importance.
I respect Margaret Atwood's opinion here but I don't quite hold it myself. More so about Oryx and Crake and sequels.
By "IDK if "The Testaments" qualifies though" I mean that I have not read it, just "The Handmaids Tale" so I'm not going to opine on something that I don't know about.
I would imagine the distinction attempted here is that despite writing those novels, Atwood doesn't consider herself to be an SF author, perhaps Harrison says he is an SF author. Atwood also won for "The Blind Assassin" which very much is not Science Fiction, it's historical fiction, it's not history but all the stuff happening in the background was real.
This shades over somewhere. If your story features an England ruled by literal Nazis it's Science Fiction (alternate history is a type of SF, "What if the Nazis won?" is a fairly popular theme) but if your England just has some Nazi sympathizers and your story is set in the 1930s it might just be historical fiction.
It doesn't pass the test that e.g. a novel set on the actually existing International Space Station does. It does contain a core fictional scientific "what-if" extrapolation.
I respect the author's opinion here and I hold a different opinion, for that reason.