There is possibility of it being thunderbolt, because it could be that shape to thunderbolt But they wouldnt put that on the connector, because < 3% are gonna have thunderbolt on their mac.
TBH, it really looks fake as Apple never would make a dock connector that huge. Look at the size of the current one, the would not go back to this. It could be thunderbolt, as in you buy another cable (more money from Apple) that connects one end into the dock connector and other into the thunderbolt port. Could be a new video one that outputs to HDMI (Another cable).
To the OP: you should tell them they gave you the wrong thing they would send you another one and you'll have both