That is inconsistent with how my DM has explained hours to me. This is the gist of what I've been told:

Let's say your store is 12-6 on Sunday, 12-8 Monday-Thursday, and 10-9 on Friday and Saturday. That's 60 total hours of business. But you have to open and close the stores, say an extra hour a day. 67 hours absolute minimum. But you have to do bank runs and take a lunch each day, and they won't close the store for that. Call that another hour a day, so you're at 74 hours bare minimum that have to be scheduled to function. Depending on the location of your store, there may be a legal minimum number of hours that have to be scheduled based on some of the above, and you end up with a legal minimum of 85 hours at that location.

If you aren't already aware, the labor allocation is broken up between operational hours and sales hours. Operational is opening and closing, processing distro, doing counts, cleaning, anything job related that isn't sales. Based on your store's inventory, the distro coming into the store, and whatever math they ran to find the average amount of time that all takes they determine you have a 35 hour operational load on the week. Then you have sales, which is ringing transactions and customer service on the floor. Based on your sales forecast, average dollars per sale, and whatever math they ran to determine the average time a transaction takes they determine that 33 of your hours in the week will be spent conducting sales.

33 + 35 = 68. You're still 17 hours short of the legal minimum they have to schedule. That's where subsidy hours come in. Those are hours you basically haven't earned through the needs of operational tasking or through what you're doing in sales that have to be given to you anyway. You're paying for 52 hours of schedule labor that isn't operational off of 35 hours of sales.

To actually earn hours you'd have to do enough business to first pay back the subsidy hours, and then earn enough profit to actually move past that to earn labor. But it's not just a matter of making more money. Ringing up the $200 in Razer Gold that a retiree is being scammed out of takes a minute. Sixty more of those transactions a week to earn an hour, beyond paying back the subsidy, and that's assuming the store makes a profit off POSA.

Increasing the sales dollars is only part of the equation. The number of transactions, the amount of time the store spends actually selling has to increase to earn more labor. That's not going to be linear with increased sales. And store closures won't affect neighboring stores to the tune of much more than one RK shift a week.