I agree and don't think the cover itself is objectionable. Covers and remixes are a valuable and essential part of musical tradition and this is a good piece of art even though it's derived from the work of Yuzuki Ryōka and SOAD without approval.

The "plagiarism machines" part is about the way machine learning companies use unpaid and underpaid labor of millions and pass that off as the work of a quasi-sentient machine, often with the explicit aim of replacing the countless creative workers whose work was used to build the mashup machine. I think I'm actually pretty anti-copyright but at least the rules should also apply when it's a tech corp cribbing from masses of proles.

A cartoon cat singing a nu-metal song about ADHD while sounding like Marianne Faithfull with a cold is the least we deserve in return.