It has purchased and stashed away in the DHF over 5 million HIVE, while adding over a million HBD to circulation, earning a profit of around 1.5 million USD for DHF, and while continually erasing Hive inflation (making Hive temporarily net deflationary while still paying rewards) and reducing the circulating supply of Hive below that of Steem (previously Hive had inflated more).

The purchased HIVE probably helps support the price of HIVE and the sold HBD probably helps get HBD closer to the peg, but neither is really provable as price action always has many factors (the quantity of added buying and locking away of HIVE Is provable though). I think that's a dent, but you make your own decision.