I find it difficult to believe that the Hastings battlefield has been misidentified for almost a millennium and that one guy winkled out the truth.  The whole story smacks of yet another conspiracy theory to me.  It will be interesting to see if he gets an excavation approved and if anything comes of it.

Not necessarily.  It depends on several factors, how active the gleaners were, what if anything was officially done to clear the battlefield, subsequent land use can disturb and scatter remains.  The fact that this guy is claiming nothing has been found does not mean nothing ever has.The guy could be right, but he could also be just trying to generate controversy where none existed before.  I think that his claims need to be looked at with a healthy does of skepticism.  The establishment will also push back pretty hard.  I would imagine they will try to stop any digging done at the site he claims and if any is done they will do their best to discredit anything found.If nothing else, the claim that the battlefield is misidentified will make people look harder to prove they have it right.  At worst, we are witnessing the birht of yet another conspiracy theory though what the conspiracy might be I have no idea.

It matters that the site is properly identified so that historians who write about the battle and the public that reads said books can get a clear understanding of what happened.  Terrain makes a huge difference in the course a battle takes and if the battle was indeed at another site then our understanding of the course of the battle and the reason for Williams victory is probably wrong.  This is especially true at Hastings because according to all contemporary accounts of the battle terrain played a decisive role.