Sewerslvt's older and maybe some newer(?) albums are a genre called Lolicore, which is sort of like an offshoot of Breakcore which is an offshoot of Jungle/D&B. Lolicore can be characterized by high-BPM drum loops and pitch-shifted anime girl samples.
Apparently, the way some of these people see it, "lolicore is a scene mainly composed of elements of rape, child abuse, murder, there can be nice songs that once represented the beginning of innocents and the more baseboosted or slower songs are considered to be "downers" sewerslvt would be an ex. of "downer" lolicore." Hence the older album art is supposed to be a 'criticism' of child abuse...
Dude's a fucking freak and there's a deep rabbit hole to go down here.