That's quite intriguing me so far (Dump or Staking) will the two scenarios is not far to happen, just take note that crypto liquidity is high during holidays, its december people is needing funds for the season, that's why 500K XTZ might be destined for liquidity or maybe i'm wrong.
I have the same feeling. I think it will be used as liquidity if we are looking at its transaction history:
The transaction came from Gate.io to that address and then that address sent it to Binance.