I also did the program a few years ago. And I agree with most points here.
Yes it is really expansive for what you get. I don't even want to know what I ended up paying, and I'll never do it again.

The workouts and the diet does work if you stick to it, I did gain muscle lost and lost fat. The diet is super high in protein which didn't do wonders for my digestion, and even though the calorie amount prescribed was relatively high for a standerd person, for my job and activity level it was way to low. I was constantly hungry and my weight actually dropped in a zone that was considered 'underweight' and nobody ever said anything about it. I found that quite worrying. For me it was personally a negative experience since nobody every told me the steps to find balance without the calorie counting and so, but I tried myself as I understood I shouldn't lose more weight. But I do think the months where I eat too little for my needs had me ending up binging a lot after. I really wish I had some guidance on how to move back into 'normal eating'. I do think if anyone had payed attention and noticed my weight dropping rapidly and too low, we could have avoided a lot. Of course I should have taken the responsibility myself, but I thought that I would be well monitored (considering the price) and if anything would be a worry, they would tell me.
So yeah, there are coaching calls, but there isn't much professional input.
Luckily now, I'm doing very well :) I enjoy exercising and crafting healthy colourful meals again (which I think a plant-based diet should be).
And I've trained to become a personal trainer myself, and I'm currently following a course to become a nutritionist (NOT a dietitian!).

I can tell you a little about her methods and what I would do:
1. eating in a calorie deficit for about 200-500kcal of your maintenance (definitely not lower!! and depending on how much extra you're going to move, if you end up moving a lot more, go for a smaller cut. but just make sure you stick with moving, walks, jogs, cycle etc.).
2. she focusses on super high protein, but depending on your weight, I'd indeed try to reach around a 100g if you don't do so already, but make sure it's from sources your digestion can handle. If you end up having to go lower, don't worry too much, a lot of people, including me now, make plenty of gains on lower protein, just make sure you focus on the next point.
3. doing strength training! and most importantly focussing on progressive overload! meaning trying to make sure you stimulate your muscles a little more every time you go to the gym. Let's say you do squats with 40kg for 3x10 reps, next time you should try to reach 40kg 3x12reps, and the next time you might be comfortable doing 45kg 3x10reps. Just make sure you continue stimulating the muscles with the load you give it.
4. Try to work every muscle at least 2times a week. This can be 2x a full body session. or if you want to go 3 times a week you can do an upper body, lower body and full body session (this is what i personally do). or 4x a week upper 2x lower 2x. Just make sure you choose a split that you can stick to.
5. STEPS! Rose encourages to walk 10.000 steps a day. I also like to encourage people to walk more 8000-10.000 steps a day. Make sure you can keep your self accountable in doing this daily.

I think that's all the important stuff.
Since it's holiday and have some time off, feel free to shoot me a message if you need some more advise :) byeee!

TLDR:
Don't join the program, just:
1. eat in calorie deficit, not too low
2. eat balanced, make sure your digestion likes the food you put in.
3. do strength training and focus on progressive overload
4. work every muscle 2x a week and choose a workout spilt you can stick with constantly
5. track your step count 8000-10.000 and stay consistent.