Confused about calories in Stage 4

I am in the smooth food stage, and I track everything I eat on Fitness Pal. I am confused and frankly a little concerned about calories moving forward (or even now, really). My nutritionist specifically said not to worry about calories, to concentrate on fluid and protein goals, and learning to stop eating when full. She also wants me to concentrate on mindfully planning and eating 3 meals (obviously small) and 2 snacks per day and not eat outside of those parameters. She said most peoples calories fall between 700 and 1000 per day. This all makes sense to me.

What I am concerned about is I have read several different places on this site where people are eating 300 calories per day! I can't imagine how they get their protein in! Even at 500 calories it seems like you can't be getting any variety. Even on the soft food stage I have hit 500 calories. Today I had 3 TBS egg whites and 1 tbs Ricotta omelet; snack of a protein shake made with water (90k); lunch of 1/4 cup cottage cheese with 1/2 banana; snack of cup of bone broth and 1/4 c. sugar free jello pudding made with Fairlife Milk; dinner of 1/2 packet of cream of wheat with 2 tbs. Ricotta, 2 tbs. sugar free apple sauce, 1/4 c. refried beans. My calories were just over 500, my protein was 60. I am comfortably full. But my concern is that I am eating too much! And once I go to "normal" foods, I am afraid I won't be able to stick to such a low amount.

What do people eat per day in calories (including protein shakes) in the rapid weight loss months?