Because they have a future financial plan in place which the EFL have accepted is viable (despite the takeover being currently suspended ) . Bury on the otherhand have no money, no visible means of support , no plan and nothing on the horizon, basically they will go pop any moment. so its easier to cancel a couple of games and set a deadline that hope it all goes away and re-jig the results etc if they eventually go under after playing 15 games.
It may well be 'in place' but as they still have no money, hence no bolstering of the squad, they have been forced to field weakened sides which only to the benefit of the opposition. Why has this situation been allowed by the EFL? Surely until such time as the money is in they should have had their matches deferred / re-jigged ?