I think he proves a very big bug in the entire ripple system.
If anyone can make those imaginary BTC or any other currency in the ripple system, and he sends that fake currency to alot of persons..
User 1, Fake bitcoin owner try to buy something paying with bitcoins in ripple, starts a topic or something, and send the fake BTC first.
User 2, receives the fake BTC and send the item who was selling (LTC, ripples, USD,etc) then he realizes that he cant trade his BTC anywhere, because its fake and get scammed.
Does Bitcoin have a bug because if someone convinces you to send your Bitcoin to their account, you lose them? If people aren't able to safely use powerful tools, then the world is not ready for either Ripple or Bitcoin.
I'm a pretty sophisticated user, and every time I send Bitcoins, I admit I have this moment of panic where I wonder if I've done everything exactly right because I know that if I cut/pasted the wrong account or made some other similar mistake, my money is gone. While we can do some work to make both systems safer, this really is just a question of whether people are ready for access to powerful financial tools that permit pseudonymous transactions that are irreversible or whether people are just too dumb and careless to be trusted with that kind of power and will only hurt themselves.
It's not a simple question.