lol @ the "REAL stuff"...
Just to let you know, there are only two kinds of "stuff". First is the "stuff" that is functional. Second is the stuff that is fantasy based.
What distinguishes the two is how training is accomplished. If the training is "alive" (not to be confused with all-out sparring or brutality), it will become functional. If the training is "dead", it will probably not develop your skill in any appreciable manner.
That is the simplest way of expressing the difference.
As different schools train in different manners, you'll have to visit a particular school to see how it is they train before you can draw a conclusion.
So to answer your question, the "real" stuff isn't Original JKD anymore than its Concepts JKD. Both types of groups can train as dead as anyone.