It’s the club’s money but the Glazers decide how much of it is spent. We have no idea what prospective owners will want, they might want a freeze on new signings, they might allow things to go as being planned or have their own ideas. They might not be advanced enough to have any kind of say or impact.
Why would the Glazer freeze on new signings when it's not their money and doesn't affect them at all? There are context where I understand your point, some teams rely on the owners pockets but it's not the case at United, so why would they do something that has no benefits to gain from?