yeah I started watching the video before reading your OP, and I went like Cypher in The Matrix, "I know that my eyes are telling me that these are three very sexy girls dancing and singing, but my brain knows that it's most likely AI"
And if it's not AI, it' surprising how someone would go through the hassle of writing a song, designing a choreography, teach it to the girls, fixing costumes and special effects, when a nerdy kid could do it all by himself in a day, after school.