It may refer to his renowned ability to freestyle over any beat, where the specific track "doesn't matter" because of his natural talent for improvisation.
This is the most likely interpretation, where a producer has titled their original beat "Doesn't Matter" and tagged it as a "Juice WRLD Type Beat" to indicate it has the melodic, emo-rap, or trap characteristics associated with his music. (FREE) Juice WRLD Type Beat "Doesn't Matter"
Juice WRLD's legacy often centers on the idea that "it doesn't matter" what others think as long as the music is vulnerable and real . It may refer to his renowned ability to