December 1, 2020: Hint #7 Apply SHA256 and repeat for all the auction months.
Thanks. OP updated with latest hint published on November 1, 2020.
Money gone 1 minute after release of Hint #7 .... very clever or very suspicious !
A 100 CPD reward for the first person to post private key seems to have been declared in their Telegram group. I have updated that in OP.