Jovaro, first of all TalkOrigins is not famous for its honesty in dealing with the data. It has the primary purpose, and perhaps the only purpose, of trying to debunk creation science. That's fine, but it's not a good reference to use for that exact reason.
In E=mc^2, it is not energy that changes as the speed of light changes, it is atomic mass. That is why I referenced you to Setterfield's charts. He shows, with references, that the atomic mass itself has been shown as increasing at the same time the speed of light has been seen as decreasing.
The data is there.
On the other hand, you have already delcared that you not only do not know the truth but that you have no way of knowing the truth yourself, so I am wondering why you are arguing about this, as though you were aware of the truth of the matter.