Looking up the Oxford dictionary, the definition of "boogie" is:
A style of blues played on the piano with a strong, fast beat.
From Wikipedia it is defined as:
Boogie (sometimes called post-disco) is a rhythm and blues genre of electronic dance music with close ties to the post-disco style
As I am unfamiliar with the genre, I tried a few sample of boogie music. I don't really see it matches the atmosphere of the anime (neither the 2000 nor 2019 adaptation). Boogiepop himself "seems fond of whistling the prelude to Wagner's Die Meistersinger von Nürnberg" which is also not related to boogie genre.
Also I don't see it too related to pop genre either.