No, it is old. Since end of Alpha 10, begin of Alpha 11:
Auto Clean Up
ECC Planet and its Sector are very attractive – that attractive that players park their structures there and don’t even care about the Taxes. This is unfortunately not in the best interest of the whole community, because others have to render an unused structure.
So keep in mind that your structures are being removed from there if you did not warp with them in the last 7 days !