There is no doubt they do, it just seems impossible to do it at any sort of reasonable level. It would actually be better for them if the price mooned first. They could convert fiat demands into much less of the available supply.
Discussion
I don't think there's anything in the prospectus that prevents them from buying and selling... So yeah I'd fully expect them to sell spot and nuke the market from time to time
The world has never experienced a strictly scarce liquid asset, and for that reason I believe it will act in a way we just can't predict