TapoutXT and eating back calories

I suggest reading this article to explain how this whole thing works.
http://www.myfitnesspal.com/topics/show/654536-in-place-of-a-road-map-2-0-revised-7-2-12

New. 60 years old. Day 15 TapoutXT. Can someone please explain "eating back workout calories"? I'm doing 1850 calories a day, do Tapout 6 days a week for at least 30 minutes per DVD (hey, I'm 60- gotta start somewhere). 40 protein, 35 carbs, 25 fat. Am I in the ballpark? Very rigid with the diet. All advise welcome. Thanks.

I love TapouT XT!! Mike Karpenko is so motivating and entertaining. I have done the first program 2 times and am now starting XT 2. I have loved the results I got from these programs, the muscles, weight lose, and endurance is great!! I would definitely follow the eating guide, it is planned out perfectly for a balanced diet and workout calorie expenditure.