This is not tithing in any sense of the word. It is coercive, manipulative and defiitely a money grab.
Congregations are supposed to come to an agreement on an amount to send to the org. every month for the "world wide work" and while they are not legally obligated, they will be directed to/understand that it is their moral and ethical obligation to pony up-no matter how much it hurts. There are always certain ones in a congregation who will make up the difference if they possibly can. These are sometimes well off bros and sisters, and sometimes are the ones that are known as soft touches-even if they are not well off. It's less about deep pockets than open ones.
In the meantime, they are supposed to send all spare monies in their congregation bank accounts (beyond 3 mos operating costs) straight to that same donation fund. All this in lieu of paying for KH mortgages anymore. However, they will be required to pony up for "minor" repairs and maintenance of the KH. Any homowner knows that there is rarely such a thing as a minor expense when repairs are involved. How much less so when you have parking lots, security fences, large HVAC and multiple bathrooms, sometimes apartments, huge roofs. . . well, this is clearly going to cause issues down the road.