Better not be!
I had real estate investments there! Besides, an exploded "counter Earth" on the far side of the sun would fill Earth's orbit with big chunks of planet. Not cool.
Of course, a real "counter Earth" would have been detected a long time ago, even before the advent of space probes.
Of course, the "exploded planet" theory has several major flaws. Not least of which is nobody really knows any way to make a planet explode.