I think you have a valid point, they just want to sell their Bitcoin at good rates and for that they have bought some Bitcoin back to let the investors know that they aren't dumping their 50k Bitcoin at market.

However, they're still interested in converting their Bitcoin to fiat and that's why they're doing it in a way where they're getting some good values for their Bitcoin.

I'm pretty sure that they're targeting $55k per Bitcoin rate and for that they'll slowly dump their holdings from time to time and wait for market recovery after those dumps and then dump it again.