Shy Glizzy and Lil Uzi Vert have collabed before atleast like 2 times and he has also bitten/remixed songs from other DMV artists. Even if the song isn't originally from Shy Glizzy, it's not hard to imagine that he heard it and decided to remix the song himself.
you think its more likely he heard a shy glizzy remix with 100k views than the original which has 9m?