And, have you read the results? That mining rig is doing 20 000 Khash, or 20 Mhash.
The S9 is reaching 14 Thash...about 600 000 times more than 40 Samsung phones.
And think of the power, your usual power bank with 10 000Mah would be able to deliver 12Wh, that's Wh, not kWH.

That was just a publicity stunt, nothing more, the phones will never mine enough to pay even one charge.