Your car isn't engineless because when its engine dies, you will know about it and have to do something. S3 is serverless because if one of the servers storing my files die, I have no way of even knowing it happened.
I didn't invent the terminology. Like many many things in this business the terms used are often confusing/wrong/overloaded/re-invented-from-the-1980's and so on. Part of the landscape unfortunately.