My guess is that it really is using a new chip with the old board design (why reinvent that portion if its works?).
I'm wondering if this is the new Samsung chip that has been in the news and that they simply don't work to spec? This happened commonly in the "old days" back around 2014 with GAWs rebranded miners and other manufacturers.
If so, they are likely just dumping at a small margin to recover their losses while they work out whatever went wrong.
My 2 cents.
Samsung is manufacturing 10nm for EBANG miners, Im pretty sure.
This is most probably dump of old chips, because new miner on 12nm TSMC process comes March-April (Lets say S9+).
It make sense, because when Dragons (if exist) and Bitfury and new S9+ hits the market, theese chips will be worth nothing. Now there can be some desperate users with cheap or free electricity that can buy it.
Thats my view.