We cannot know for sure what will happen until Genesis officially announces that they will sell or have sold out. We can only follow the data on BTC Spot ETF every day to make an assessment. I think that is also part of what makes this market exciting.
I wonder if we will ever get a confirmation.
Genesis is a subsidiary of DCG, since it's a private venture fund it's not forced to disclose its finances other than if investors ask for them, and even so it can tell only the story about the finances of the group, their last report for example purposely left out Genesis from the financial summary.
So we might never know when they sold, if they did so if they just transferred ownership and etc etc.
But even so, I doubt both them and their creditors are going to do something stupid to cause a serious dump. Or at least I hope!