Why is it linked to a slow loss

Probably because your BMR is lower. Heavier people, say, a 300 lb woman might have a BMR of 2,600 calories a day. A 200 lb woman might have a BMR of 1,700 calories a day.

So if both were sleeved and can only eat 1,000 calories a day, the heavier woman has a deficit of 1600 calories (almost a half pound of fat) for the day, whereas the lighter woman has a deficit of 700 calories (1/5 lb of fat) for the day.

Probably because your BMR is lower. Heavier people, say, a 300 lb woman might have a BMR of 2,600 calories a day. A 200 lb woman might have a BMR of 1,700 calories a day.

So if both were sleeved and can only eat 1,000 calories a day, the heavier woman has a deficit of 1600 calories (almost a half pound of fat) for the day, whereas the lighter woman has a deficit of 700 calories (1/5 lb of fat) for the day.

Perfect explanation!