It doesn't look like that video was a hoax. Just somebody that really knows how to stay ahead of the plane. Some planes wing rock really bad, but can be controlled with aileron.

From you description of how you are trying to enter a harrier, that is a classic cause of wing rock on any plane.
Check your CG by performing an inverted 45 and watching the drop. 10:1 odds your plane is nose heavy. Once the CG is set, do an elevator by entering a straight downline then pull full elevator and hold it. The nose of the plane should come to about 45 nose high and stay there (a little throttle might be requried <1/4). Once in an elevator you can easily get to the harrier by adding throttle until the altitude loss is zero. You may have to jockey the throttle and elevator to maintain the harrier. Then use aileron to control the wing rock.

Also your lateral balance might be off.

Also simulators do not fly like the real thing, the model you got for the sim might not be that accurate, all of them require some type of tinkering.

The Andrew Jesky model has more than likely already had this done before they released it.