Incorrect and incomplete on the Hugos
"All four awards for books at the Hugo Award"
I believe you're thinking of the four *fiction* awards: Best Novel, Best Novelette, Best Novella, and Best Short Story. Of those four, only Best Novel is likely to go to a standalone book.
(There is a second category, Best Related Work, which often goes to books, in which no award was given.)
"were won by women after it was plagued by claims, made by the group Sad Puppies, that it advanced a 'niche, academic, overtly to the left in ideology and flavour' viewpoint."
...and after another group, the Rabid Puppies, engaged in block voting to game a bunch of truly odious works onto the ballot, crowding out many fine possible choices with a variety of authorial genders. (Yes, rule changes have been made.)