I can tell you no one I know has applied RD and received early acceptance.
There is one (and ONLY one) exception to this that I am aware of. And that is merit scholarship finalists, who find out about a month early in Feb. It is not an official notice, but I have never heard of a finalist who did not get accepted.
But yeah, I have no idea what yofaith and the other thread is talking about. The other recent mention of this was someone talking about a friend of a friends daughter or some other such nonsense, of which I do not believe.