It's because Damon named them both for opposite reasons in his dumbass quote “Co-writing is very different to writing. I’m not hating on anybody, I’m just saying there’s a big difference between a songwriter and a songwriter who co-writes. … A really interesting songwriter is Billie Eilish and her brother. I’m more attracted to that than to Taylor Swift. It’s just darker — less endlessly upbeat. Way more minor and odd. I think she’s exceptional.”
sounds like the song is about current events "The internet's gone wild watching movie stars on trial," Eilish sings during the song. "While they're overturning Roe v. Wade."