The Lady Astronaut series by Mary Robinette Kowal. The first book is called The Calculating Stars. Basically, an alternate history where (spoiler for the opening chapter) ::: spoiler spoiler a meteor wipes out the east coast and kick-starts climate change, causing the Space Age to start 10 years early. ::: It follows a Jewish computer (a woman who literally runs calculations for NASA, as seen in Hidden Figures) who wants to become an astronaut, and her struggles with the racism and misogyny of the 1950s.
No, that’s the point of a dog whistle. Those in the know understand, and they don’t want outsiders to notice. One of the best ways to combat these people is to let everyone in on their “secret” codes, so we can see exactly who is putting their hat in with the Nazis.