The calorie counting question is to find out if you actually have a calorie deficit over the week as it's actually quite a small calorie restriction, even if it doesn't feel like it and you did enquire as to why you're not continuing to lose weight.
The reason to do this diet is to lose weight and/or the health benefits but it's not a magic pill. It's easier than starving every day of the week, imho but there does actually have to be some calorie deficit. No need to actually count calories, just be aware of what you're eating on the 5 days.
You're on target with your overall weight-loss...if you look at the average loss for this group as a whole. I would think the gym is your issue here.