Will they hold them or not sell them at once? This is the important point. No problem if it doesn't sell. But if they are all sold at once, then it can create an atmosphere of panic. But this panic does not last long. They will recover in a short time. So there is nothing to worry about in my opinion.
Mt.Gox's release of bitcoins to pay victims during that year will not increase the bitcoin supply, since there are still 21 million bitcoins in the world, so I don't think it's too serious here.
If people get their bitcoins back and they sell all of them on the market, this is seen as the next opportunity for those who don't trust enough to buy bitcoins when bitcoin was at $17k and they regretted it hitting $23k in recent days. It is better to see this as an opportunity rather than another cause for concern, a drop in bitcoin is good for us.