Several things are wrong here.
The moment your balance went below 2 mbtc all requirements should be cancelled as the freespins winnings are lost at this point.
T&C say 40 times wagering requirement on winnings. Not a word about playthrough on the deposit.
The screenshot he attached with 0.00033740 winnings with 0.0134 playthrough confirms that deposited amount has no requirements.
Since he continued playing with a ending balance of 8.7 mtc then he should be paid 3.3 mbtc in winnings from the freespins plus the 2 mbtc deposit on top.
5.3 mbtc in total.
that is one of the points i tried to make but had success communicating this.
in my experience, this type of gimmick with unfavorable terms and bizarre calculations are not of western origination, i am strongly inclined to believe that trust dice is operating out of china, whatever implications that may have.