With cloning technology being refined within 100 years or so, what would happen if you literally went to "go fuck yourself".
Double penetration.
If you're the same person in two bodies (like, telepathic communication, you still "feel" like one person), then it's masterbation. Otherwise it's incest, as it's identical from a genetic perspective to having sex with your identical twin.
Identical twins have the same DNA as each other, but different from their parents. A clone, however, only has one parent and has exactly the same DNA as that parent.
...I don't think you read what you quoted closely enough? It confirms what I said. Your clone and your identical twin both have DNA that's identical to your own.