jm oÖâ¤eAdS øx,zÓÀEA>øWìæ¡åýÒL¥he is subsidizing them out of his own funds I would guess. He can borrow the hash form himself but has to pay the miners the return they would have got mining BTC.
https://whatsonchain.com/tx/7f2b4ef3ee8120bf2e6523b4a5f5799f48e3eb08595222947fe7dcf05bc4c39e