I found this, but it's an interview in Dutch (which I don't speak): https://www.538.nl/bas-en-dylan/het-mysterie-rondom-het-nummer-zo-zomer-van-john-de-koning h

I found this, but it's an interview in Dutch (which I don't speak): https://www.538.nl/bas-en-dylan/het-mysterie-rondom-het-nummer-zo-zomer-van-john-de-koning https://www.538.nl/bas-en-dylan/het-mysterie-rondom-het-numm... They seem to think the lyrics are handcrafted, but performed by AI. For all I know they are just guessing.