The article's thesis might or might not be true (I don't think it is in the field of cryptography), but the article certain it doesn't provide anywhere near enough evidence to conclude that the trope of "Alice and Bob" is used to oppress people.

The article cites one presentation that a single researcher used as evidence that Alice and Bob are viewed as a couple, but I've seen enough crypto presentations to assert that most researchers don't view Alice and Bob as a couple in any way (in fact, many crypto presentations use Bob the builder and Lewis Carroll's Alice to represent Alice and Bob, and they certainly don't make a couple).