Isn't just music playing in the movie rather than them singing the song in-universe? The AIDS would definitely count tho.

Technically, "A Brighter Summe Day" is based on the story of a real teenager who was responsible for a crime in Taiwain as its focus point but the film is meant to be less of one person's narrative and more of an exploration about a society and its sociopolitical problems at the time that leads to the characters react in certain ways to the environment around them. Young gangs are created as a sense of security from a flawed educational system that leaves them unsure of their future, a husband and father is suspected by the government of working for the Communist Party Of China, a wife lives an unsatisfied life, etc. It is also one of the most epic stories I've ever seen and one of my favorite movies of all time.

Maybe instead of attacking the concept of representation in film, we should criticize lazy writing. White, straight and cisgender stories are allowed to be as bad as they are without accusing them of them forcing their "identity politics" on us but when it has a black, female or gay character, we blame the very fact that they are there for the film failing.

Having diversity/representation and having a great story are not mutually exclusive. In fact, I think the issue is that often these works are created by people who don't actually represent those communities and do not understand how those very communities do themselves want good stories that also include them in it.