Wikipedia

You mean the article that includes the quote explaining why it's not a thing:

, "Bi lighting often feels ubiquitous, even when there isn't a hint of bisexuality in sight [...] These are the colors of magic in fantasy, alien landscapes in sci-fi, and the neon lighting of cyberpunk settings and nightclubs. Thus, while Twitter users and media critics have noted bi lighting in John Wick 3, Blade Runner 2049, Color Out of Space, Orphan: First Kill, Bingo Hell, Men in Black: International, Bullet Train and Spider-Man: Into the Spider-Verse, there's often a less gay logic for doing so."

TLDR: the prevalence of examples where pink and blue light are used together without wanting to represent bisexuality make it useless as an indicator (at least on its own)